Printing head assembly and three-dimensional printing equipment

Abstract

The invention relates to a printing head assembly and three-dimensional printing equipment, and the printing head assembly comprises a material conveying unit which comprises a first conveying wheel and a second conveying wheel which are arranged at an interval so as to define a conveying channel used for extruding consumables or drawing back the consumables in the first direction; the cutter unit comprises a cutter part and a first rotating shaft, the relative position of the first rotating shaft and the conveying channel is fixed, the axis of the first rotating shaft is parallel to the first direction, and the cutter part is connected to the first rotating shaft and arranged at the first end of the conveying channel; under the action of external force acting on the cutter part in the second direction, the cutter part can rotate around the first rotating shaft to a first position so as to cut the consumables extruded out of the conveying channel, the cutter part can further rotate around the first rotating shaft to a second position so as to be away from the conveying channel, and the second direction is perpendicular to the first direction. The consumable can be cut off quickly and effectively, the occupied space is small, and structural miniaturization is facilitated.

Description

Technical Field

[0001] This application relates to the field of 3D, and in particular to a printhead assembly and a stereolithography device. Background Technology

[0002] Fused Deposition Modeling (FDM) is a method that uses heated and melted filaments to print and deposit them layer by layer to form a three-dimensional object.

[0003] When changing filaments during 3D printing, the filaments need to be withdrawn from the print head. Since the filaments in the nozzle area of ​​the print head are in a molten state, withdrawing them can cause contamination or seepage into other parts of the print head, affecting its efficiency. Therefore, it is essential to provide a print head assembly and 3D printing equipment that can cut off the filaments and withdraw the solid parts from the print head during filament replacement. Summary of the Invention

[0004] This application provides a printhead assembly and a 3D printing device that can quickly and effectively cut consumables, while also occupying less space and facilitating miniaturization.

[0005] In a first aspect, the printhead assembly provided in the embodiments of this application includes:

[0006] A material conveying unit includes a first conveying wheel and a second conveying wheel spaced apart to define a conveying channel for extruding or retracting consumables along a first direction; and

[0007] The cutting unit includes a cutting blade and a first rotating shaft. The relative position of the first rotating shaft and the conveying channel is fixed, and the axis of the first rotating shaft is parallel to the first direction. The cutting blade is connected to the first rotating shaft and disposed at the first end of the conveying channel.

[0008] Under the action of an external force acting on the cutter in the second direction, the cutter can rotate around the first axis to a first position to cut the consumable located in the conveying channel. The cutter can also rotate around the first axis to a second position to move away from the conveying channel, wherein the second direction is perpendicular to the first direction.

[0009] In some embodiments, the cutting member includes a handle portion connected to the first rotating shaft and a cutting edge portion disposed on the handle portion, and the cutting member is configured as a lever;

[0010] The connection center between the handle portion and the first rotating shaft is the fulcrum of the lever. The handle portion has a first side portion and a second side portion that are set at an angle and are respectively located on both sides of the fulcrum.

[0011] The blade portion is fixed to the first edge portion as the resistance point of the lever, and the external force is applied to the second edge portion as the power point of the lever;

[0012] The distance between the power point and the fulcrum is greater than the distance between the resistance point and the fulcrum;

[0013] The blade is configured to rotate to the first position under the action of the external force to cut the consumable.

[0014] In some embodiments, the second edge is set at an angle to the second direction.

[0015] In some embodiments, the cutting blade includes a handle portion and a cutting edge portion. The handle portion has a third side portion and a fourth side portion. The third side portion has a first end and a second end disposed opposite to each other. The first end of the third side portion is connected to the first rotating shaft, and the cutting edge portion is connected to the fourth side portion.

[0016] The third and fourth sides are arranged at an angle and are located on both sides of the first rotating shaft. The distance between the second end of the third side and the first rotating shaft is greater than the distance between the blade and the first rotating shaft.

[0017] In some embodiments, the cutting unit further includes a first sensing element;

[0018] The relative position of the first sensing element and the conveying channel is fixed;

[0019] The first sensor is configured to trigger the material delivery unit to retract the consumable after sensing that the cutter is in the first position, and / or to trigger the cutter to stop rotating.

[0020] In some embodiments, the first sensing element has a first photoelectric generating groove;

[0021] The cutting blade includes a first blocking part. When the cutting blade is rotated to the first position, the first blocking part is inserted into the first photoelectric generating slot or pulled out from the first photoelectric generating slot.

[0022] The first sensor is configured to trigger the material conveying unit to retract the consumable after sensing that the first blocking part is inserted into or removed from the first photoelectric generating slot, and / or to trigger the cutter to stop rotating.

[0023] In some embodiments, it further includes a first housing, the material conveying unit being disposed within the first housing, and the cutting element being rotatably connected to the first housing via the first rotating shaft;

[0024] The cutting unit further includes a first reset member, which is connected between the cutting member and the first housing, and is used to drive the cutting member to rotate around the first pivot from the first position to the second position, so as to move away from the conveying channel.

[0025] In some embodiments, the first reset member is a torsion spring that is constrained by the cutter member;

[0026] The first reset member includes 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, while the second elastic part abuts against the first housing.

[0027] When the cutter is in the first position, the first reset member is compressed between the cutter and the first housing.

[0028] In some embodiments, the cutter has a mounting space recessed into the surface of the cutter at one end in a 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 connecting the first side surface and the second side surface.

[0029] The cutting component also includes a first limiting part protruding from the bottom surface of the mounting space;

[0030] The first reset member further includes a connecting portion connected between the first elastic portion and the second elastic portion, the connecting portion being constrained between the first limiting portion and the mounting space;

[0031] When the cutter rotates, the free end of the first elastic part abuts against the first side and moves perpendicular to the first direction, and the free end of the second elastic part abuts against the first housing and moves perpendicular to the first direction.

[0032] In some embodiments, the cutting member has a receiving space on the side facing the first housing;

[0033] The first reset member is a spring partially housed within the receiving space, with one end of the first reset member abutting the surface of the receiving space and the other end abutting the first housing.

[0034] In some embodiments, the printhead assembly further includes an outlet, a feed channel, and a sensing unit disposed at the second end of the conveying channel, the second end of the conveying channel being disposed opposite to the first end of the conveying channel;

[0035] The discharge port, the inlet channel, and the conveying channel are connected in sequence;

[0036] The sensing unit includes a light-blocking component and a second sensing component, and the light-blocking component can move to a third position or a fourth position;

[0037] When the feed channel does not contain the consumable, the light-blocking member is in a third position, and the light-blocking member in the third position can extend to block at least part of the feed channel;

[0038] When the consumable is present in the feeding channel, the consumable in the feeding channel can push the light-blocking component to the fourth position;

[0039] In this configuration, one of the light-blocking components located in the third position and the light-blocking component located in the fourth position blocks the second sensor, while the other does not block the second sensor.

[0040] In some embodiments, the sensing unit further includes a second reset element;

[0041] When the feed channel does not contain the consumable, the second reset member can drive the light-blocking member to move to the third position.

[0042] In some embodiments, the printhead assembly further includes a first drive unit;

[0043] The first driving unit is located at one end of the material conveying unit in the second direction, and is used to drive the material conveying unit to extrude or retract the consumable;

[0044] And / or,

[0045] The printhead assembly is mounted on the second drive unit, which drives the printhead assembly to move along the second direction. The printhead assembly can move along the second direction until the cutter abuts against the environmental element, so that the environmental element applies the external force to the cutter.

[0046] Secondly, the stereoscopic printing device provided in the embodiments of this application includes the printhead assembly provided in any of the above embodiments.

[0047] In some embodiments, the stereoprinting apparatus further includes a second housing;

[0048] The printhead assembly is disposed within the second housing, and the printhead assembly is movable along the second direction until the cutter abuts against the second housing, so that the second housing applies the external force to the cutter.

[0049] Compared with the prior art, the beneficial features of the embodiments of this application are as follows: the printhead assembly and the stereolithography device include a material conveying unit and a cutting unit. The material conveying unit includes a first conveying wheel and a second conveying wheel spaced apart to define a conveying channel for extruding or retracting consumables along a first direction. The cutting unit includes a cutting blade and a first rotating shaft. The relative position of the first rotating shaft and the conveying channel is fixed, and the axis of the first rotating shaft is parallel to the first direction. The cutting blade is connected to the first rotating shaft and disposed at the first end of the conveying channel. When it is necessary to replace the consumables, an external force acting on the cutting blade along a second direction can be applied to the cutting blade to rotate the cutting blade around the first rotating shaft to a first position, thereby quickly and effectively cutting the consumables located in the conveying channel. After cutting the consumables, the cutting blade can also rotate around the first rotating shaft to a second position to move away from the conveying channel. Moreover, the cutting blade is disposed at the first end of the conveying channel and rotates around the first rotating shaft parallel to the first direction to cut the consumables, which not only occupies less space but also has a shorter stroke, which is more conducive to the miniaturization of the printhead assembly. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the printhead assembly according to an embodiment of this application;

[0051] Figure 2 for Figure 1 The diagram shows a printhead assembly with part of the first housing removed.

[0052] Figure 3 for Figure 1 The top view of the printhead assembly is shown, with the cutter in the second position;

[0053] Figure 4 for Figure 3 The image shows a bottom view of the printhead assembly.

[0054] Figure 5 for Figure 1 The printhead assembly shown is a top view, with the cutter in the first position;

[0055] Figure 6 for Figure 5 The image shows a bottom view of the printhead assembly.

[0056] Figure 7 for Figure 6 The diagram shows a printhead assembly with part of the first housing removed.

[0057] Figure 8 for Figure 1 A partial structural diagram of the printhead assembly is shown;

[0058] Figure 9 for Figure 8 A front view of a partial structure of the printhead assembly shown;

[0059] Figure 10 for Figure 9 The right view;

[0060] Figure 11 for Figure 1 Top view of the cutter unit of the printhead assembly shown;

[0061] Figure 12 for Figure 11 The diagram shows the structure of the shank portion in the cutting unit.

[0062] Figure 13 for Figure 11 The diagram shows the structure of the shank portion in the cutting unit.

[0063] Figure 14 for Figure 1 A schematic diagram of the sensing unit of the printhead assembly shown;

[0064] Figure 15 This is a top view of the cutter unit in the printhead assembly of an embodiment of this application.

[0065] Figure 16 This is a bottom view of the printhead assembly according to an embodiment of this application.

[0066] Wherein: 100-Printhead assembly (1-Material delivery unit (101-Delivery channel (101a-First end of delivery channel, 101b-Second end of delivery channel), 102-First delivery wheel assembly (1021-First drive wheel, 1022-First delivery wheel), 103-Second delivery wheel assembly (1031-Second drive wheel, 1032-Second delivery wheel)), 2-Cutter unit (201-Cutter component (2011-Handle part (20111-Groove structure, 20112-Hole)) Structure, 20113-Installation space (201131-First side, 201132-Second side, 201133-Bottom, 201134-First clearance area, 201135-Second clearance area, 201136-Third clearance area), 20114-First edge, 20115-Second edge, 20116-Main body, 20117-Limiting body, 20118-Third edge, 20119-Fourth edge), 2012-Blade section, 2013-The 1. A shielding part, 2014-fulcrum, 2015-second limiting surface, 2016-first limiting part (20161-protrusion, 20162-cylinder), 2017-second limiting part, 2018-third limiting part, 2019-accommodating space), 202-first sensing element (2021-first photoelectric generating groove), 203-first resetting element (2031-first elastic part, 2032-second elastic part, 2033-connecting 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 part (7011-Main part (70111-Straight arm, 70112-Arc arm), 7012-Second shielding part), 702-Second sensing part (7021-Second photoelectric generating groove), 703-Second rotating shaft, 704-Second reset part)), 8-Second housing (801-Protrusion, 802-Main body). Detailed Implementation

[0067] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0068] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0069] 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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0070] (Example 1)

[0071] Please refer to Figures 1 to 11 One embodiment of this application provides a printhead assembly 100, including 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 consumables along a first direction and to retract consumables along the first direction. Specifically, along the first direction, the delivery channel 101 has a first end 101a and a second end 101b disposed opposite to each other. When extrudes consumables, the consumables move from the second end 101b to the first end 101a of the delivery channel 101. When retracting consumables, the consumables move from the first end 101a to the second end 101b of the delivery channel 101. The cutter unit 2 includes a cutter 201 and a first rotating shaft 204. The first rotating shaft 204 is fixed in relative position to the delivery channel 101, is disposed close to the first end 101a of the delivery channel 101, and its axis is parallel to the first direction. The cutter 201 is connected to the first rotating shaft 204 and is disposed at the first end 101a of the conveying channel 101. When it is necessary to cut consumables, under the action of an external force acting on the cutter 201 in the second direction, the cutter 201 can rotate around the first rotating shaft 204 to such a position. Figure 6 The first position shown allows for cutting of the consumable material located in the conveying channel 101. After cutting is completed or when cutting of the consumable material is no longer required, the cutter 201 can also rotate around the first pivot 204 to a position as shown. Figure 4 The second position shown is thus away from the conveying channel 101. The second direction is perpendicular to the first direction.

[0072] In this embodiment, when it is necessary to replace the consumable, an external force acting on the cutter 201 along the second direction can be applied to the cutter 201, causing the cutter 201 to rotate around the first rotating shaft 204 to the first position, thereby quickly and effectively cutting off the consumable extruded from the conveying channel 101 and preventing the molten consumable from being drawn back. After cutting off the consumable, the cutter 201 can also rotate around the first rotating shaft 204 to the second position to move away from the conveying channel 101. Moreover, the cutter 201 is located at the first end 101a of the conveying channel 101 and rotates around the first rotating shaft 204 parallel to the first direction to cut the consumable. This not only results in a simple structure and small space occupation, but also a small stroke, making the structure of the printhead assembly 100 more compact and more conducive to the miniaturization of the printhead assembly 100.

[0073] As an example, the consumable can be filament.

[0074] In some preferred embodiments, the material conveying unit 1 may include a first conveying wheel 1022 and a second conveying wheel 1032 spaced apart, and the space between the first conveying wheel 1022 and the second conveying wheel 1032 is configured as a conveying channel 101.

[0075] In some preferred embodiments, please refer to Figure 11 The cutting blade 201 may include a handle portion 2011 and a cutting edge portion 2012. The handle portion 2011 is connected to a first rotating shaft 204, and the cutting edge portion 2012 is disposed on the handle portion 2011. To cut consumables more efficiently and with less effort, the cutting blade 201 may be constructed as a lever. Specifically, the connection center between the handle portion 2011 and the first rotating shaft 204 serves as the fulcrum 2014 of the lever. The handle portion 2011 has a first side portion 20114 and a second side portion 20115, which are arranged at an included angle and are located on opposite sides of the fulcrum 2014. The cutting edge portion 2012 is fixed to the first side portion 20114 as the resistance point of the lever, and an external force is applied to the second side portion 20115 as the power point of the lever. To save effort, the first distance L1 between the effort point and the fulcrum 2014 is greater than the second distance L2 between the resistance point and the fulcrum 2014. For example... Figure 5 and Figure 11 As shown, when an external force F along the second direction is applied to the power point of the cutter 201, the external force F pushes the cutter 201 to rotate around the fulcrum 2014. When the blade part 2012 rotates to the first position, it can cut the consumable material extruded from the first end 101a of the conveying channel 101.

[0076] In this embodiment, the cutter 201 can not only cut the consumable quickly and effectively, but also has a small footprint and short stroke, which is more conducive to the miniaturization of the printhead assembly 100.

[0077] In some preferred embodiments, the external force F can be applied by an environmental element. When the printhead assembly 100 moves along the second direction until the power point of the cutter 201 abuts against the environmental element, the environmental element can apply an external force F along the second direction to the cutter 201, thereby pushing the cutter 201 to rotate and cut the consumable. This eliminates the need for an additional drive mechanism to drive the cutter 201 to rotate, further saving space in the printhead assembly 100 and effectively reducing its weight and production cost.

[0078] As an example, the printhead assembly 100 can be disposed within the second housing 8 of the stereolithography device, and the second housing 8 can serve as an environmental element for applying an external force F. The printhead assembly 100 can move along a second direction to approach or move away from the second housing 8. When the printhead assembly 100 moves along the second direction until the power point of the cutter 201 abuts against the second housing 8, the second housing 8 can apply an external force F along the second direction to the cutter 201, thereby pushing the cutter 201 to rotate and cut the filament. This example not only effectively cuts the filament and facilitates the miniaturization of the printhead assembly 100, but also eliminates the need for an additional drive mechanism to drive the cutter 201 to rotate, further saving the space occupied by the printhead assembly 100, and effectively reducing the weight and production cost of the printhead assembly 100.

[0079] Other structures of the aforementioned printhead assembly 100 may interfere with the second housing 8, making it difficult or even impossible for the cutter 201 to abut against the second housing 8.

[0080] In some preferred embodiments, to address the interference problem, the second side 20115 may be angled relative to the second direction. That is, the second side 20115 may extend obliquely relative to the second direction, allowing it to protrude more significantly from the printhead assembly 100, thereby effectively abutting against the second housing 8. Figure 3 and Figure 5 As shown.

[0081] In some preferred embodiments, to further address the interference problem, the second housing 8 may include a body 802 and a protrusion 801. The body 802 has a printing chamber (not shown). The printhead assembly 100 is disposed within the printing chamber, and the protrusion 801 is disposed on the body 802 and corresponds to the cutter member 201; that is, the protrusion 801 is located on the movement path of the cutter member 201. Figure 3 and Figure 5 As shown, this further shortens the distance between the power point of the cutter 201 and the second housing 8, so that when the printhead assembly 100 moves along the second direction to abut against the second housing 8, the power point of the cutter 201 is the first to abut against the protrusion 801 of the second housing 8. Moreover, when the cutter 201 rotates to the first position to complete the cut, there is still a certain gap between the other structures of the printhead assembly 100 and the second housing 8, such as... Figure 5 As shown, this allows the cutter 201 to effectively cut the consumable.

[0082] In this embodiment, the external force F is a thrust. It should be noted that in other embodiments, the external force F can be a tension force or other forms of force, which can be set according to the actual situation, and will not be elaborated here.

[0083] It is understood that in other embodiments, other environmental elements or other driving mechanisms may provide the driving force for the cutter 201 to rotate, so as to drive the cutter 201 to rotate around the first rotating shaft 204 in other ways. This can be set according to the actual situation, and will not be described in detail here.

[0084] In some preferred embodiments, please refer to Figure 4 The cutting edge 2012 is detachably fixed to the handle 2011, facilitating the installation, removal, and replacement of the cutting edge 2012. As an example, the cutting edge 2012 can be fixed to the handle 2011 by a screw or other threaded component 205.

[0085] Please refer to Figure 11 At least one groove structure 20111 or hole structure 20112 may be provided on the aforementioned handle portion 2011. The groove structure 20111 and hole structure 20112 can be used to reduce the weight of the cutting blade 201, thereby reducing the moment of inertia.

[0086] In some preferred embodiments, the cutting unit 2 may further include a first sensor 202. The first sensor 202 is fixed in relative position to the conveying channel 101. When the first sensor 202 senses that the cutting member 201 is in a first position, the first sensor 202 can trigger the material conveying unit 1 to retract the consumable.

[0087] In this embodiment, the material delivery unit 1 will only be triggered to retract the consumable after the first sensor 202 senses that the cutter 201 is in the first position. This effectively prevents the material delivery unit 1 from retracting the consumable in a molten state, thereby preventing the molten consumable from contaminating or seeping into other parts of the printhead, extending the service life of the printhead assembly 100, and improving work efficiency.

[0088] It should be noted that in some embodiments, after the first sensor 202 senses that the cutter 201 is in the first position, the material conveying unit 1 can be triggered to retract the consumable after a preset time interval. In another embodiment, after the first sensor 202 senses that the cutter 201 is in the first position, the material conveying unit 1 can be triggered to retract the consumable immediately. The triggering timing can be set according to the actual situation, which will not be elaborated here.

[0089] As an example, please refer to Figures 1 to 7 As shown, the printhead assembly 100 may further include a first drive unit 4, which can be used to drive the material conveying unit 1 to extrude consumables and to drive the material conveying unit 1 to retract consumables. When the first sensor 202 senses that the cutter 201 is in a first position, it triggers a material extraction signal. After receiving the material extraction signal, the first drive unit 4 drives the material conveying unit 1 to retract the consumables.

[0090] In some preferred embodiments, the cutter unit 2 may include the aforementioned first sensor 202. The relative position of the first sensor 202 and the conveying channel 101 is fixed. When the first sensor 202 senses that the cutter 201 is in a first position, the first sensor 202 can trigger the cutter 201 to stop rotating, preventing the cutter 201 from continuing to rotate after cutting has been completed. This avoids the cutter 201 from over-rotating and colliding with other components, protecting not only the cutter 201 but also other components, thereby improving the service life of the printhead assembly 100.

[0091] As an example, the printhead assembly 100 may be mounted on a second drive unit (not shown). The second drive unit may be used to drive the printhead assembly 100 to move in a second direction to bring the cutter 201 closer to or away from environmental elements. For example, the second drive unit may be a belt of a CoreXY motion mechanism.

[0092] In some examples, the second drive unit can be used to drive the printhead assembly 100 to move along a second direction, so that the cutter 201 moves closer to or away from the second housing 8. When the printhead assembly 100 moves along the second direction until the power point of the cutter 201 abuts against the second housing 8, the second housing 8 can apply an external force F along the second direction to the cutter 201, thereby pushing the cutter 201 to rotate and cut the consumable. When the first sensor 202 senses that the cutter 201 is in the first position, the first sensor 202 triggers the second drive unit to drive the printhead assembly 100 to stop moving, thereby stopping the cutter 201 from rotating and keeping it in or near the first position.

[0093] As an optional implementation, when the first sensor 202 senses that the cutter 201 is in the first position, the first sensor 202 can not only trigger the material delivery unit 1 to retract the consumable, but also trigger the cutter 201 to stop rotating. Correspondingly, the printhead assembly 100 may include a first drive unit 4 and a second drive unit. When the first sensor 202 senses that the cutter 201 is in the first position, the first sensor 202 can trigger the first drive unit 4 to drive the material delivery unit 1 to retract the consumable, and the first sensor 202 can also trigger the second drive unit to drive the printhead assembly 100 to stop moving, thereby causing the cutter 201 to stop rotating.

[0094] In some preferred embodiments, please refer to Figures 8 to 11 The cutting blade 201 may also include a first blocking part 2013, which is fixed to the handle part 2011. The first sensing element 202 has a first photoelectric generating groove 2021 facing the first blocking part 2013.

[0095] In some embodiments, when the cutter 201 is in the second position, the first blocking part 2013 is not inserted into the first photoelectric generating slot 2021. The first blocking part 2013 is inserted into the first photoelectric generating slot 2021 only when the cutter 201 rotates to the first position. At this time, the first sensing element 202 senses that the cutter 201 is in the first position.

[0096] As an example, when the cutter 201 moves to the first position, the first blocking part 2013 of the cutter 201 in the first position is inserted into the first photoelectric generating slot 2021 to block the light. When the first sensor 202 senses that the first blocking part 2013 is inserted into the first photoelectric generating slot 2021 to block the light, it will trigger a material extraction signal and / or a stop movement signal. After receiving the material extraction signal, the first drive unit 4 drives the material conveying unit 1 to extract the consumable. After receiving the stop movement signal, the second drive unit drives the printhead assembly 100 to stop moving.

[0097] In other embodiments, when the cutter 201 is in the second position, the first blocking part 2013 is inserted into the first photoelectric generating slot 2021. Until the cutter 201 rotates to the first position, the first blocking part 2013 is withdrawn from the first photoelectric generating slot 2021. At this time, the first sensing element 202 senses that the cutter 201 is in the first position.

[0098] For some preferred embodiments, please refer to Figure 1 and Figure 6 The printhead assembly 100 also includes a first housing 3. The material delivery unit 1 is connected inside the first housing 3, the first sensing element 202 is fixed to the first housing 3, and the cutter element 201 is rotatably connected to the first housing 3 via a first rotating shaft 204.

[0099] As an example, please refer to Figure 4 and Figure 6 The first housing 3 may have a first limiting surface 302 facing the cutter member 201, and correspondingly, the cutter member 201 has a second limiting surface 2015 corresponding to the first limiting surface 302. When the cutter member 201 rotates to... Figure 6 In the second position shown, the second limiting surface 2015 can be exactly abutted against the first limiting surface 302, or there is a certain gap between the second limiting surface 2015 and the first limiting surface 302, thereby preventing the cutter 201 from rotating excessively.

[0100] In some preferred embodiments, please refer to Figure 6The cutter unit 2 also includes a first reset member 203. The first reset member 203 is connected between the cutter member 201 and the first housing 3. The first reset member 203 can drive the cutter member 201 to rotate around the first rotating shaft 204 from the first position to the second position, so as to move away from the conveying channel 101 to avoid the consumables, thereby facilitating the normal extrusion of consumables by the printhead assembly 100.

[0101] As an alternative implementation method, please refer to Figure 16 The first reset member 203 can be a torsion spring. The first reset member 203 is constrained by the cutter member 201. The first reset member 203 includes a first elastic portion 2031 and a second elastic portion 2032. One end of the first elastic portion 2031 and one end of the second elastic portion 2032 are connected, and the first elastic portion 2031 and the second elastic portion 2032 are arranged at an included angle. When the cutter member 201 is in the first position, the first elastic portion 2031 abuts against the cutter member 201, and the second elastic portion 2032 abuts against the first housing 3, thereby compressing the first reset member 203 between the cutter member 201 and the first housing 3. Under the restoring force of the first reset member 203, the cutter member 201 can rotate back to its initial position, i.e., the second position, around the first pivot 204. This embodiment is similar to... Figures 1 to 14 The implementation methods shown are basically the same, so the same parts will not be described again here.

[0102] As an example, please refer to Figure 11 and Figure 12The handle portion 2011 has a recessed mounting space 20113 at one end in a first direction. The mounting space 20113 has a first side surface 201131, a second side surface 201132, and a bottom surface 201133. The bottom surface 201133 connects the first side surface 201131 and the second side surface 201132. The first side surface 201131 is correspondingly disposed with the first elastic part 2031, and the second side surface 201132 is correspondingly disposed with the second elastic part 2032. The cutting blade 201 also includes a first limiting part 2016, which protrudes from the bottom surface of the mounting space 20113. The first reset member 203 is confined within the mounting space 20113. The first reset member 203 also includes a connecting portion 2033 connecting the first elastic portion 2031 and the second elastic portion 2032. The connecting portion 2033 is confined between the first limiting portion 2016 and the mounting space 20113, so that the connecting portion 2033 cannot disengage 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 may include a column 20162 and a protrusion 20161 protruding from the column 20162 in the radial direction of the column 20162. A protrusion 20161 is formed at one end of the bottom surface of the column 20162 away from the mounting space 20113. The protrusion 20161 can extend toward the mounting space 20113 in a direction perpendicular to the first direction, and there is a gap between the protrusion 20161 and the mounting space 20113 to facilitate the assembly of the connecting portion 2033 of the first reset member 203 onto the first limiting portion 2016 through the gap. The connecting portion 2033 is an arc-shaped strip structure and abuts against the surface of the column 20162. The protrusion 20161 and the mounting space 20113 cooperate to restrict the connecting portion 2033 to the column 20162, preventing the connecting portion 2033 from detaching from the column 20162. The column 20162, the protrusion 20161, and the mounting space 20113 cooperate to restrict the movement of the connecting portion 2033. The free end of the first elastic part 2031 can abut against the blade holder part 2011, and the free end of the second elastic part 2032 can abut against the first housing 3. When the cutter 201 rotates, the free end of the first elastic part 2031 abuts against the first side 201131 and moves perpendicular to the first direction, and the free end of the second elastic part 2032 abuts against the first housing 3 and moves perpendicular to the first direction. When the cutter 201 is in the initial position, i.e., the second position, the first reset member 203 is in its natural state. At this time, the printhead assembly 100 can normally extrude consumables, and the cutter 201 moves away from the consumables. When it is necessary to change the material, the cutter 201 can be driven to rotate around the first rotating shaft 204 to the first position. During the process of the cutter 201 rotating from the second position to the first position, the cutter 201 cuts the consumables. When the cutter 201 is in the first position, the cutting action is completed.Furthermore, during the process of the cutter 201 rotating from the second position to the first position, the first reset member 203 is gradually deformed by the first housing 3 and the handle portion 2011. After the cutting action is completed, under the rebound force of the first reset member 203, the cutter 201 can rotate from the first position back to the second position.

[0103] In this example, when a material replacement is needed, the printhead assembly 100 moves along the second direction toward the second housing 8. As the cutter 201 abuts against the second housing 8 and continues to move, under the action of the thrust F applied by the second housing 8, the cutter 201 rotates around the first pivot 204 to a first position to cut the consumable, completing the cutting operation. After the cutter 201 completes the cutting operation, the printhead assembly 100 moves along the second direction away from the second housing 8. During this movement, under the restoring force of the first reset member 203, the cutter 201 can rotate around the first pivot 204 toward a second position until the cutter 201 is completely separated from the second housing 8, at which point the cutter 201 rotates back to its initial position, which is the second position.

[0104] Furthermore, to further confine the first reset member 203 within the mounting space 20113, please refer to... Figure 12 and Figure 13 The cutting member 201 may further include a second limiting part 2017 and a third limiting part 2018. The second limiting part 2017 is disposed at one end of the first side surface 201131 away from the bottom surface of the mounting space 20113. That is, the second limiting part 2017 and the bottom surface 201133 of the mounting space 20113 are spaced apart and opposite to each other in the first direction. The third limiting part 2018 is disposed at one end of the second side surface 201132 away from the bottom surface 201133 of the mounting space 20113. That is, the third limiting part 2018 and the bottom surface 201133 of the mounting space 20113 are spaced apart and opposite to each other in the first direction. After the first reset member 203 is installed between the first limiting part 2016, the second limiting part 2017, the third limiting part 2018, and the mounting space 20113, in its natural state, please refer to... Figure 4 As shown, under the rebound force of the first reset member 203, the first elastic part 2031 is restricted between the second limiting part 2017 and the mounting space 20113, and the free end of the first elastic part 2031 abuts against the first side surface 201131. The second elastic part 2032 is restricted between the third limiting part 2018 and the mounting space 20113, and the free end of the second elastic part 2032 abuts against the first housing 3. When the cutter member 201 rotates to the first position, please refer to... Figure 6As shown, under the action of the first housing 3, the second elastic part 2032 is compressed to no longer be located or only partially located between the third limiting part 2018 and the mounting space 20113, but the first elastic part 2031 is still restricted between the second limiting part 2017 and the mounting space 20113. When the cutter 201 rotates from the first position to return to the second position, under the action of the rebound force of the first reset member 203 itself, the second elastic part 2032 returns to the third limiting part 2018 and the mounting space 20113, as shown. Figure 4 As shown. As an example, the bottom surface 201133 of the installation space 20113 may also have a first clearance area 201134 corresponding to the first limiting part 2016, a second clearance area 201135 corresponding to the second limiting part 2017, and a third clearance area 201136 corresponding to the third limiting part 2018.

[0105] It should be noted that the installation space 20113 can also be opened in other positions of the cutter 201, as long as the cutter 201 can rotate back to the initial position, that is, the second position, under the action of the spring force of the first reset member 203.

[0106] In some preferred embodiments, please refer to Figure 4 ,as well as Figures 6 to 8 Along the first direction, the blade holder 2011 includes a main body 20116 and a limiting body 20117, with the limiting body 20117 protruding from the main body 20116 along the first direction. The first housing 3 has a mounting cavity (not shown) and a limiting groove 301 communicating with the mounting cavity. The material delivery unit 1 is installed in the mounting cavity. The main body 20116 can be partially housed in the mounting cavity, and the limiting body 20117 protrudes from the mounting cavity and engages with the limiting groove 301, thereby allowing the cutter 201 to be partially embedded in the mounting cavity, restricting the downward movement of the cutter 291 along the first direction, and improving the stability of the printhead assembly 100.

[0107] In some preferred embodiments, please refer to Figure 4 and Figure 6 The limiting groove 301 has an arc-shaped groove surface, and the corresponding limiting body 20117 has an arc-shaped edge. The arc-shaped groove surface of the limiting groove 301 and the arc-shaped edge of the limiting body 20117 cooperate to effectively limit the rotation path of the cutter 201, further improving the stability of the print head assembly 100.

[0108] In some preferred embodiments, please refer to Figure 2 , Figure 8 and Figure 9The material delivery unit 1 includes a first delivery wheel assembly 102 and a second delivery wheel assembly 103. The first delivery wheel assembly 102 and the second delivery wheel assembly 103 are meshed together, and define a delivery channel 101. The printhead assembly 100 includes a first drive unit 4. When the first sensor 202 senses that the cutter 201 is in a first position, the first drive unit 4 is triggered to drive the material delivery unit 1 to retract the consumable. Specifically, the first drive unit 4 can drive the first delivery wheel assembly 102 to rotate clockwise or counterclockwise. Under the meshing action of the first delivery wheel assembly 102, the second delivery wheel assembly 103 rotates together with the first delivery wheel assembly 102, and the rotation direction of the second delivery wheel assembly 103 is opposite to the rotation direction of the first delivery wheel assembly 102, thereby allowing the first delivery wheel assembly 102 and the second delivery wheel assembly 103 to cooperate in extruding consumable downwards or retracting consumable upwards.

[0109] In some examples, the first drive unit 4 can be a drive motor. It should be noted that in other embodiments, the first drive unit 4 can also be other drive mechanisms, which can be set according to the actual situation, and will not be elaborated here.

[0110] As an example, the first conveyor wheel set 102 and the second conveyor wheel set 103 are respectively connected to the first housing 3. Please refer to... Figures 8 to 10 The first conveying wheel assembly 102 may include a first drive wheel 1021 and a first conveying wheel 1022 fixed together and coaxially arranged. The second conveying wheel assembly 103 may include a second drive wheel 1031 and a second conveying wheel 1032 fixed together and coaxially arranged. The first drive wheel 1021 and the second drive wheel 1031 are meshed together. The first conveying wheel 1022 and the second conveying wheel 1032 are opposite to each other and spaced apart, defining a conveying channel 101.

[0111] In some preferred embodiments, please refer to Figures 8 to 10 The printhead assembly 100 also includes an outlet 5, a feed channel 6, and a sensing unit 7, which are respectively located at the second end 101b of the conveying channel 101.

[0112] The aforementioned discharge port 5, feed channel 6, and conveying channel 101 are connected sequentially along the first direction. When extruding consumables, the consumables enter the feed channel 6 through the discharge port 5 and are then extruded through the conveying channel 101. When retrieving consumables, the consumables enter the feed channel 6 through the conveying channel 101 and are then retrieved through the discharge port 5.

[0113] Please refer to Figures 8 to 10 ,as well as Figure 14The aforementioned sensing unit 7 may include a light-blocking member 701 and a second sensing member 702. The light-blocking member 701 can move to a third position or a fourth position. When there is no consumable in the feeding channel 6, the light-blocking member 701 is in the third position, and the light-blocking member 701 in the third position can extend to block at least part of the feeding channel 6. When there is consumable in the feeding channel 6, the consumable in the feeding channel 6 will squeeze the light-blocking member 701, thereby pushing the light-blocking member 701 to move to the fourth position.

[0114] Among them, one of the light-blocking member 701 in the third position and the light-blocking member 701 in the fourth position blocks the second sensor 702, while the other does not block the second sensor 702.

[0115] As an optional implementation, the light-blocking member 701 in the third position does not block the second sensing member 702. Please refer to [reference needed]. Figure 14 As shown. The light-blocking member 701, located in the fourth position, blocks the second sensing member 702.

[0116] As an example, please refer to Figure 14 As shown, the light-blocking member 701 may include a main body 7011 and a second blocking portion 7012, with the second blocking portion 7012 fixed to the main body 7011. The main body 7011 has a first end and a second end disposed opposite to each other. The first end of the main body 7011 is connected to the first housing 3 via a second rotating shaft 703, and the light-blocking member 701 can rotate around the second rotating shaft 703. The second sensor 702 is fixed to the first housing 3, and the second sensor 702 has a second photoelectric generating 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 a third position. In the third position, the second end of the main body 7011 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 generating groove 7021 and does not block the second sensor 702. When there is consumable material in the feeding channel 6, the consumable material in the feeding channel 6 will squeeze the light blocking member 701, thereby pushing the light blocking member 701 to rotate around the second rotating shaft 703 to the fourth position. During the process of the light blocking member 701 rotating from the third position to the fourth position, the second blocking part 7012 gradually inserts into the second photoelectric generating groove 7021, blocking the second sensing member 702.

[0117] In some preferred embodiments, please refer to Figure 10 and Figure 14Along the direction from the first end to the second end of the main body 7011, the main body 7011 may include an integrally formed straight arm 70111 and an arc-shaped arm 70112. The arc-shaped arm 70112 of the light-blocking member 701 in the third position can extend to block at least a portion of the feed channel 6. When there is consumable material in the feed channel 6, the consumable material in the feed channel 6 can push the arc-shaped arm 70112 of the light-blocking member 701, causing the light-blocking member 701 to move to the fourth position.

[0118] In this embodiment, the main body 7011 includes a straight arm 70111 and an arc-shaped arm 70112 that are integrated together. This not only effectively reduces the space occupied by the main body 7011, making the structure of the printhead assembly 100 more compact and facilitating the miniaturization of the printhead assembly 100, but also minimizes the interference of the main body 7011 with the consumables, preventing the consumables from being unable to enter the conveying channel 101 from the feeding channel 6 due to the interference of the main body 7011.

[0119] As an example, the second shielding part 7012 can be fixed to one side of the arc-shaped arm 70112 and set close to the straight arm 70111, which can prevent the second shielding part 7012 from interfering with other environmental components and consumables.

[0120] In some preferred embodiments, please refer to Figure 14 As shown, the sensing unit 7 also includes 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, causing the second blocking part 7012 to be withdrawn from the second photoelectric generating slot 7021, thereby triggering a material replacement signal. The material replacement mechanism (not shown) starts to replace the consumable after receiving the material replacement signal. That is to say, the second blocking part 7012 will only be withdrawn from the second photoelectric generating slot 7021 and the material replacement signal will only be triggered after the consumable has been completely withdrawn. Since the consumable will squeeze the main part 7011 of the light-blocking member 701 when there is consumable in the feeding channel 6, thereby keeping the second blocking part 7012 inserted in the second photoelectric generating slot 7021 and blocking the second sensing member 702, the material replacement signal will not be triggered before the consumable has been completely withdrawn, that is, the material replacement mechanism will not replace the material. This can effectively prevent the printhead assembly 100 from malfunctioning when the material changing mechanism performs a material changing action before the consumable has been completely cut off.

[0121] 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 its natural state. When the consumable presses the main body 7011 of the light-blocking member 701, pushing the light-blocking member 701 to rotate to the fourth position, the second reset member 704 is deformed by compression. Therefore, after the material extraction action is completed, that is, when the consumable no longer presses the light-blocking member 701, under the action of the rebound force of the second reset member 704, the light-blocking member 701 rotates around the second rotating shaft 703 back to the third position.

[0122] As an optional implementation, the printhead assembly 100 operates as follows: When the cutter 201 completes its cutting action, i.e., when the cutter 201 is in the first position, the first blocking part 2013 is embedded in the first photoelectric generator slot 2021 to block the light, triggering a material extraction signal. After receiving the material extraction signal, the first drive unit 4 drives the material conveying unit 1 to extract the material. When the consumable is completely extracted from the feeding channel 6, under the action of the second reset member 704, the light blocking member 701 pops out to the third position, and the second blocking part 7012 is extracted from the second photoelectric generator slot 7021, thereby triggering a material replacement signal. The material replacement mechanism replaces the consumable after receiving the material replacement signal.

[0123] (Example 2)

[0124] One embodiment of this application provides a printhead assembly 100, please refer to... Figure 15 The handle portion 2011 has a third side portion 20118 and a fourth side portion 20119. The third side portion 20118 has a first end and a second end that are disposed opposite to each other. The first end of the third side portion 20118 is connected to the first rotating shaft 204, and the cutting edge portion 2012 is connected to the fourth side portion 20119. The third side portion 20118 and the fourth side portion 20119 are disposed at an included angle, and the third side portion 20118 and the fourth side portion 20119 are disposed on both sides of the first rotating shaft 204. The distance L3 between the second end of the third side portion 20118 and the first rotating shaft 204 is greater than the distance L4 between the cutting edge portion 2012 and the first rotating shaft 204.

[0125] It should be noted that Embodiment 2 is basically the same as Embodiment 1, so the same parts will not be described again here.

[0126] (Example 3)

[0127] One embodiment of this application provides a printhead assembly 100, please refer to... Figure 16The first reset member 203 is a spring. Specifically, the cutter member 201 has a receiving space 2019 on the side facing the first housing 3. The first reset member 203 is a spring partially housed within the receiving space 2019, with one end abutting the surface of the receiving space 2019 and the other end abutting 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 restoring force of the first reset member 203, the cutter member 201 can rotate back to its initial position, i.e., the second position, around the first pivot 204.

[0128] As an example, the receiving space 2019 can be formed in the handle portion 2011. It should be noted that the receiving space 2019 can also be formed in other locations of the cutting blade 201, which will not be elaborated here.

[0129] It should be noted that Embodiment 3 is basically the same as Embodiment 1, so the same parts will not be described again here.

[0130] The stereoscopic printing device of this application includes the printhead assembly 100 provided in any of the above embodiments.

[0131] In this embodiment, when it is necessary to replace the consumable, an external force acting on the cutter 201 along the second direction can be applied to the cutter 201, causing the cutter 201 to rotate around the first rotating shaft 204 to the first position, thereby quickly and effectively cutting off the consumable extruded from the conveying channel 101 and preventing the molten consumable from being drawn back. After cutting off the consumable, the cutter 201 can also rotate around the first rotating shaft 204 to the second position to move away from the conveying channel 101. Moreover, the cutter 201 is located at the first end 101a of the conveying channel 101 and rotates around the first rotating shaft 204 parallel to the first direction to cut the consumable. This not only results in a simple structure and small space occupation, but also a small stroke, making the structure of the printhead assembly 100 more compact and more conducive to the miniaturization of the printhead assembly 100.

[0132] In some preferred embodiments, the stereolithography apparatus further includes a second housing 8. A printhead assembly 100 is disposed within the second housing 8, and the printhead assembly 100 is movable along a second direction until the cutter 201 abuts against the second housing 8, so that the second housing 8 applies an external force to the cutter 201. This embodiment not only effectively cuts consumables and facilitates the miniaturization of the printhead assembly 100, but also eliminates the need for an additional drive mechanism to drive the cutter 201 to rotate, further saving the space occupied by the printhead assembly 100, and effectively reducing the weight and production cost of the printhead assembly 100.

[0133] As an example, the printhead assembly 100 can be disposed within the second housing 8 of the stereolithography device. The printhead assembly 100 can move along a second direction to approach or move away from the surface of the second housing 8. When the printhead assembly 100 moves along the second direction until the power point of the cutter 201 abuts against the surface of the second housing 8, the second housing 8 can apply an external force F along the second direction to the cutter 201, thereby pushing the cutter 201 to rotate and cut the filament. This example not only effectively cuts the filament and facilitates the miniaturization of the printhead assembly 100, but also eliminates the need for an additional drive mechanism to drive the cutter 201 to rotate, further saving the space occupied by the printhead assembly 100, and effectively reducing the weight and production cost of the printhead assembly 100.

[0134] Please refer to Figure 5 Other structures of the printhead assembly 100 may interfere with the second housing 8, making it difficult or impossible for the cutter 201 to abut against the surface of the second housing 8.

[0135] In some preferred embodiments, to further address the interference problem, the second housing 8 may include a body 802 and a protrusion 801 disposed on the body 802 and corresponding to the cutter member 201, such as... Figure 3 and Figure 5 As shown, this further shortens the distance between the power point of the cutter 201 and the second housing 8, so that when the printhead assembly 100 moves along the second direction to abut against the second housing 8, the power point of the cutter 201 is the first to abut against the protrusion 801 of the second housing 8. Moreover, when the cutter 201 rotates to the first position to complete the cut, there is still a certain gap between the other structures of the printhead assembly 100 and the second housing 8, such as... Figure 5 As shown, this allows the cutter 201 to effectively cut the consumable.

[0136] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0137] The above embodiments merely illustrate preferred implementations of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A printhead assembly, characterized in that, include: The material conveying unit includes a first conveying wheel and a second conveying wheel spaced apart to define a conveying channel for extruding or retracting consumables along a first direction. and The cutting unit includes a cutting blade and a first rotating shaft. The relative position of the first rotating shaft and the conveying channel is fixed, and the axis of the first rotating shaft is parallel to the first direction. The cutting blade is connected to the first rotating shaft and disposed at the first end of the conveying channel. Under the action of an external force acting on the cutter in the second direction, the cutter can rotate around the first axis to a first position to cut the consumable located in the conveying channel. The cutter can also rotate around the first axis 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 as claimed in claim 1, characterized in that, The cutting component includes a handle portion connected to the first rotating shaft and a cutting edge portion disposed on the handle portion, and the cutting component is constructed as a lever; The connection center between the handle portion and the first rotating shaft is the fulcrum of the lever. The handle portion has a first side portion and a second side portion that are set at an angle and are respectively located on both sides of the fulcrum. The blade portion is fixed to the first edge portion as the resistance point of the lever, and the external force is applied to the second edge portion as the 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 blade is configured to rotate to the first position under the action of the external force to cut the consumable.

3. The printhead assembly as described in claim 2, characterized in that, The second side is set at an angle to the second direction.

4. The printhead assembly as claimed in claim 1, characterized in that, The cutting blade includes a handle portion and a cutting edge portion. The handle portion has a third side portion and a fourth side portion. The third side portion has a first end and a second end that are disposed opposite to each other. The first end of the third side portion is connected to the first rotating shaft, and the cutting edge portion is connected to the fourth side portion. The third and fourth sides are arranged at an angle and are located on both sides of the first rotating shaft. The distance between the second end of the third side and the first rotating shaft is greater than the distance between the blade and the first rotating shaft.

5. The printhead assembly as described in any one of claims 1-4, characterized in that, The cutting unit also includes a first sensing element; The relative position of the first sensing element and the conveying channel is fixed; The first sensor is configured to trigger the material delivery unit to retract the consumable after sensing that the cutter is in the first position, and / or to trigger the cutter to stop rotating.

6. The printhead assembly as claimed in claim 5, characterized in that, The first sensing element has a first photoelectric generating groove; The cutting blade includes a first blocking part. When the cutting blade is rotated to the first position, the first blocking part is inserted into the first photoelectric generating slot or pulled out from the first photoelectric generating slot. The first sensor is configured to trigger the material conveying unit to retract the consumable after sensing that the first blocking part is inserted into or removed from the first photoelectric generating slot, and / or to trigger the cutter to stop rotating.

7. The printhead assembly as claimed in claim 1, characterized in that, It also includes a first housing, the material conveying unit is disposed inside the first housing, and the cutting element is rotatably connected to the first housing via the first rotating shaft; The cutting unit further includes a first reset member, which is connected between the cutting member and the first housing, and is used to drive the cutting member to rotate around the first pivot from the first position to the second position, so as to move away from the conveying channel.

8. The printhead assembly as claimed in claim 7, characterized in that, The first reset element is a torsion spring that is constrained by the cutter element; The first reset member includes 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, while the second elastic part abuts against the first housing. When the cutter is in the first position, the first reset member is compressed between the cutter and the first housing.

9. The printhead assembly as claimed in claim 8, characterized in that, The cutter has a mounting space recessed into its surface at one end in a 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 connecting the first side surface and the second side surface. The cutting component also includes a first limiting part protruding from the bottom surface of the mounting space; The first reset member further includes a connecting portion connected between the first elastic portion and the second elastic portion, the connecting portion being constrained between the first limiting portion and the mounting space; When the cutter rotates, the free end of the first elastic part abuts against the first side and moves perpendicular to the first direction, and the free end of the second elastic part abuts against the first housing and moves perpendicular to the first direction.

10. The printhead assembly as claimed in claim 7, characterized in that, The cutting blade has a receiving space on the side facing the first housing; The first reset member is a spring partially housed within the receiving space, with one end of the first reset member abutting the surface of the receiving space and the other end abutting the first housing.

11. The printhead assembly as claimed in claim 1, characterized in that, The printhead assembly also includes a discharge port, a feed channel, and a sensing unit disposed at the second end of the conveying channel, wherein the second end of the conveying channel is disposed opposite to the first end of the conveying channel; The discharge port, the inlet channel, and the conveying channel are connected in sequence; The sensing unit includes a light-blocking component and a second sensing component, and the light-blocking component can move to a third position or a fourth position; When the feed channel does not contain the consumable, the light-blocking member is in a third position, and the light-blocking member in the third position can extend to block at least part of the feed channel; When the consumable is present in the feeding channel, the consumable in the feeding channel can push the light-blocking component to the fourth position; In this configuration, one of the light-blocking components located in the third position and the light-blocking component located in the fourth position blocks the second sensor, while the other does not block the second sensor.

12. The printhead assembly as claimed in claim 11, characterized in that, The sensing unit further includes a second reset element; When the feed channel does not contain the consumable, the second reset member can drive the light-blocking member to move to the third position.

13. The printhead assembly as claimed in claim 1, characterized in that, The printhead assembly also includes a first drive unit; The first driving unit is located at one end of the material conveying unit in the second direction, and is used to drive the material conveying unit to extrude or retract the consumable; And / or, The printhead assembly is mounted on the second drive unit, which drives the printhead assembly to move along the second direction. The printhead assembly can move along the second direction until the cutter abuts against the environmental element, so that the environmental element applies the external force to the cutter.

14. A stereoscopic printing device, characterized in that, Includes the printhead assembly as described in any one of claims 1 to 13.

15. The stereoscopic printing apparatus as described in claim 14, characterized in that, The stereo printing equipment also includes a second housing; The printhead assembly is disposed within the second housing, and the printhead assembly is movable along the second direction until the cutter abuts against the second housing, so that the second housing applies the external force to the cutter.

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