CN218256820U - Reciprocating type feeding mechanism applied to handheld 3D drawing device - Google Patents

Abstract

Be applied to handheld 3D and draw reciprocating type feeding mechanism of device, handheld 3D draws the device and is applicable to the consumptive material heating of solid and melts and be used for drawing 3D works, and reciprocating type feeding mechanism includes: the feeding device comprises a power source, a transmission assembly and a plurality of feeding assemblies, wherein the transmission assembly drives the plurality of feeding assemblies to move periodically and alternately in a reciprocating mode under the action of energy provided by the power source and acts on the consumable materials so as to continuously drive the consumable materials to move forwards.

Description

Reciprocating type feeding mechanism applied to handheld 3D drawing device

Technical Field

The utility model relates to a 3D prints technical field, especially relates to a handheld 3D draws device and reciprocating type feeding mechanism thereof.

Background

Handheld 3D draws device, like 3D printing pen, 3D drawing pen, it is controlled by the staff, can carry out the solid drawing according to people's wish. The working principle of the pen is that solid consumables are conveyed to a heating mechanism to be heated and melted to form hot melt materials, the hot melt materials are extruded out from an outlet at the front end of the pen, and required 3D drawing works are formed after the hot melt materials are cooled.

To complete the rendering of a 3D work, the hot melt material needs to be continuously delivered from the pen front end outlet, which requires continuous forward transport of the solid consumable to the location of the heating mechanism. Conventional 3D drawing pens typically include a feed mechanism for driving the consumable forward. The thread feeding mechanism is generally a gear driving mechanism or a thread driving mechanism. The gear drive mechanism includes a gear set engagement consumable driven by a motor to propel the consumable forward by friction between a rotating gear and the consumable. The screw drive mechanism includes a motor-driven drive member having a screw thread tooth to engage the consumable and to urge the consumable forward by friction between the rotating screw thread tooth and the consumable.

However, the diameter tolerance of the conventional wire feeding mechanism for the consumable material is strict, and if the friction force is too large when the consumable material is engaged by the gear or the thread teeth, the motor is stopped to stop the wire feeding so that the consumable material cannot be conveyed forward. If the friction is too small, the gear or the thread teeth are caused to idle and cannot effectively bite the consumable, so that the consumable slips, and the consumable cannot be continuously conveyed forward.

In addition, the existing wire feeding mechanism makes the feeding and returning operations of the consumable material more complicated. Because under the state that this gear drive mechanism or this screw thread actuating mechanism do not start, this gear drive mechanism's two send silk gear or this screw thread actuating mechanism's thread tooth can prevent the material loading and the material returned of this consumptive material to can not directly push this heating mechanism of this 3D drawing pen or directly take out this consumptive material from 3D drawing pen with the front end of this consumptive material one step.

Disclosure of Invention

An advantage of the utility model is that a handheld 3D draws device and reciprocating type feeding mechanism thereof is provided, wherein reciprocating type material mechanism that moves forward through at least one pay-off subassembly drive consumptive material of reciprocating motion to be used for carrying this consumptive material forward.

Another advantage of the present invention is to provide a handheld 3D drawing device and reciprocating type feeding mechanism thereof, wherein reciprocating type feeding mechanism makes the consumptive material of a solid can be carried forward continuously through a plurality of feeding components of round trip reciprocating motion to continuously make this consumptive material carried to a hot melt mechanism and heated and melted with output hot melt material.

Another advantage of the utility model is that a handheld 3D draws device and reciprocating type feeding mechanism thereof is provided, and is wherein a plurality of a pay-off subassembly among the pay-off subassembly is moving forward with this consumptive material of drive at least, thereby guarantees that this consumptive material has a pay-off subassembly to move forward driving this consumptive material all the time in transportation process all the time at least to make this consumptive material can be carried forward continuously.

Another advantage of the utility model is that a handheld 3D draws device and reciprocating type feeding mechanism thereof is provided, wherein is a plurality of this consumptive material of pay-off subassembly drive alternately moves forward to make this consumptive material can be carried forward incessantly.

Another advantage of the present invention is to provide a handheld 3D drawing device and a reciprocating feeding mechanism thereof, wherein in some embodiments, when one of the feeding assemblies moves forward to the foremost position and the switching time of the backward movement is needed, at least one of the other feeding assemblies is still in the forward movement process, so that the reciprocating feeding mechanism keeps continuously driving the consumable to move forward.

Another advantage of the utility model is that a handheld 3D draws device and reciprocating type feeding mechanism thereof is provided, wherein each a feeding element among the pay-off subassembly receives the drive and reciprocating motion, and when the feeding element moved forward, through contacting with this consumptive material and can promote this consumptive material and remove with realizing driving this consumptive material synchronous forward.

Another advantage of the utility model is that a handheld 3D draws device and reciprocating type feeding mechanism thereof is provided, wherein a plurality of be in forward movement in the pay-off subassembly the pay-off component is greater than a plurality of to the forward driving force of this consumptive material be in backward movement in the pay-off subassembly the pay-off component drives the effort that this consumptive material tends to backward movement to guarantee that this consumptive material can be driven forward reliably and stably to remove.

Another advantage of the present invention is to provide a handheld 3D drawing device and reciprocating feeding mechanism thereof, wherein the feeding speed of the consumable is controlled by the distance and the moving speed of the feeding element moving forward in each feeding cycle through the design.

Another advantage of the present invention is to provide a handheld 3D drawing device and reciprocating type feeding mechanism thereof, wherein because the feeding element is arranged to be suitable for keeping elastically contacting with this consumptive material, thereby this consumptive material can directly back open the feeding element and make its front end move and arrive the position of hot melting mechanism is in order to accomplish the material loading and prepare the step, thereby can block the direct material loading preparation operation of this consumptive material unlike traditional advance silk gear or thread tooth actuating mechanism.

Another advantage of the present invention is to provide a handheld 3D drawing device and reciprocating type feeding mechanism thereof, wherein the feeding element and this consumptive material can be separated thereby conveniently follow withdraw from this consumptive material in the handheld 3D drawing device to make things convenient for the replacement of this consumptive material.

Another advantage of the present invention is to provide a handheld 3D drawing device and reciprocating feeding mechanism thereof, wherein the feeding element contacts with this consumptive material through the effect of elastic force down to the diameter that allows this consumptive material can have relatively great tolerance, and is not comparatively strict to the diameter tolerance requirement of this consumptive material in traditional 3D printing pen.

Another advantage of the utility model is that a handheld 3D draws device and reciprocating type feeding mechanism thereof is provided, wherein thereby feeding element can be separated convenient the follow with this consumptive material is taken out to a transfer passage that handheld 3D drawn device to make things convenient for the replacement of this consumptive material.

Another advantage of the utility model is that a device and reciprocating type feeding mechanism are drawn to handheld 3D is provided, wherein the device is drawn to handheld 3D can conveniently return the material through mechanical structure, thereby reciprocating type feeding mechanism's a driving motor's electrode polarity need not set up to changeable polarity to need the reversal motor to provide the reversal operation and take out the consumptive material unlike traditional gear or screw thread actuating mechanism.

Another advantage of the utility model is that a handheld 3D draws device and reciprocating type feeding mechanism thereof is provided, wherein the pay-off component is less with this consumptive material area of contact, thereby when handheld 3D draws device disposes a dyeing machine and can provide the dyeing of multiple colour, the last dyestuff that is infected with of pay-off component is less relatively to interference when changeing the dyestuff dyeing to this consumptive material influences lessly relatively.

Another advantage of the utility model is that a handheld 3D draws device and reciprocating type feeding mechanism thereof is provided, wherein handheld 3D draws device simple structure, convenient operation.

The utility model provides a reciprocating type feeding mechanism for handing 3D draws device, handheld 3D draws device is applicable to the consumptive material heating melting of a solid and is used for drawing 3D works, wherein reciprocating type feeding mechanism includes:

at least one power source;

at least one transmission assembly; and

the transmission assembly drives the first feeding assembly and the second feeding assembly to alternately move back and forth under the action of energy provided by the power source and acts on the consumable to drive the consumable to move forwards.

In some embodiments, the first feeding assembly comprises a first driving rack and a first feeding element connected to the first driving rack, and the second feeding assembly comprises a second driving rack and a second feeding element connected to the second driving rack, wherein the transmission assembly periodically drives the first driving rack and the second driving rack to move back and forth under the action of energy provided by the power source so as to drive the corresponding first feeding element and the corresponding second feeding element to move back and forth and contact the consumable so as to drive the consumable to move forward.

In some embodiments, the transmission assembly drives the first driving rack to move forward to drive the corresponding first feeding element to move forward, and simultaneously drives the second driving rack to move backward to drive the corresponding second feeding element to move backward; when the transmission assembly drives the first driving frames to move backwards to drive the corresponding first feeding elements to move backwards, the transmission assembly simultaneously drives the second driving frames to move forwards to drive the corresponding second feeding elements to move forwards.

In some embodiments, the reciprocating feeding mechanism further comprises a third feeding assembly and a fourth feeding assembly, wherein the transmission assembly further drives the third feeding assembly and the fourth feeding assembly to move reciprocally and act on the consumable to drive the consumable to move forwards under the action of the energy provided by the power source.

In some embodiments, the third feeding assembly includes a third driving rack and a third feeding element connected to the third driving rack, and the fourth feeding assembly includes a fourth driving rack and a fourth feeding element connected to the fourth driving rack, wherein the transmission assembly periodically drives the third driving rack and the fourth driving rack to move back and forth under the action of energy provided by the power source to drive the corresponding third feeding element and the fourth feeding element to move back and forth and contact the consumable to drive the consumable to move forward.

In some embodiments, the reciprocating feeding mechanism further comprises a third feeding assembly and a fourth feeding assembly, wherein the third feeding assembly comprises a third driving rack and a third feeding element connected to the third driving rack, and the fourth feeding assembly comprises a fourth driving rack and a fourth feeding element connected to the fourth driving rack, wherein the transmission assembly periodically drives the third driving rack and the fourth driving rack to move back and forth under the action of the energy provided by the power source so as to drive the corresponding third feeding element and the corresponding fourth feeding element to move back and forth and contact the consumable so as to drive the consumable to move forward.

In some embodiments, the power source includes a drive motor and an output shaft, and the transmission assembly includes a connecting member and a reciprocating control wheel, wherein the drive motor rotates under the supply of electrical energy, and the connecting member is connected to the output shaft and adapted to rotate synchronously with the rotating drive motor and to drive the reciprocating control wheel to rotate, so that the reciprocating control wheel drives the first and second feed assemblies to move reciprocally.

In some embodiments, the power source includes at least one driving motor and at least one output shaft, and the transmission assembly includes a connecting member, a first reciprocating control wheel and a second reciprocating control wheel, wherein the driving motor rotates under the supply of electric energy, and the connecting member is connected to the output shaft and adapted to rotate synchronously with the rotating driving motor and drive the first reciprocating control wheel and the second reciprocating control wheel to rotate, so that the first reciprocating control wheel drives the first feeding assembly and the second feeding assembly to move reciprocally, and the second reciprocating control wheel drives the third feeding assembly and the fourth feeding assembly to move reciprocally.

In some embodiments, the first and second reciprocating control wheels are driven simultaneously by the same drive motor, or the first and second reciprocating control wheels are driven by two drive motors, respectively.

In some embodiments, the reciprocating control wheel has a front driving surface with a curved surface and a rear driving surface with a curved surface, the first driving frame and the second driving frame each have a front acting surface and a rear acting surface, and when the reciprocating control wheel is driven to rotate, the front driving surface and the rear driving surface of the reciprocating control wheel respectively act on the front acting surface and the rear acting surface of the first driving frame and the second driving frame to drive the first driving frame and the second driving frame to move reciprocally, so as to drive the corresponding first feeding element and the corresponding second feeding element to move reciprocally.

In some embodiments, the first and second drive carriages each have an action slot, the front and rear side action faces of each of the first and second drive carriages being located on opposite sides of the action slot, the position on the surface of each of the front and rear drive faces of the shuttle wheel being driven to periodically rotate into the action slot to respectively interact with the front and rear side action faces of the respective first and second drive carriages.

In some embodiments, the front and rear drive faces of the reciprocating control wheel each have at least one peak location, at least one valley location, and at least two gradual changes extending between one of the adjacent peak and valley locations, wherein the peak and valley locations of the front drive face and the valley and peak locations of the rear drive face are on opposite sides of the reciprocating control wheel.

In some embodiments, the first and second reciprocating control wheels each have a front driving surface with a curved surface and a rear driving surface with a curved surface, the first, second, third and fourth driving frames each have a front acting surface and a rear acting surface, and the front and rear driving surfaces of the first reciprocating control wheel respectively act on the front and rear acting surfaces of the first and second driving frames to drive the first and second driving frames to move reciprocally and thereby drive the corresponding first and second feeding elements to move reciprocally and reciprocally when the first reciprocating control wheel is driven to rotate; when the second reciprocating control wheel is driven to rotate, the front side driving surface and the rear side driving surface of the second reciprocating control wheel respectively act on the front side acting surface and the rear side acting surface of the third driving frame and the fourth driving frame to drive the third driving frame and the fourth driving frame to move in a reciprocating manner, so that the third feeding element and the fourth feeding element are driven to move in a reciprocating manner.

In some embodiments, each of the first, second, third and fourth drive frames has an action slot, the front and rear action faces of each of the first and second drive frames are located on opposite sides of the action slot, and the positions on the surfaces of the front and rear drive faces of the first shuttle wheel are driven to periodically rotate into the action slot to respectively interact with the front and rear action faces of the corresponding first and second drive frames; the front and rear side engagement surfaces of the respective third and fourth drive frames are located on opposite sides of the engagement slot, and the positions on the respective surfaces of the front and rear side drive surfaces of the second reciprocating control wheel are driven to periodically rotate into the engagement slot to respectively engage the front and rear side engagement surfaces of the respective third and fourth drive frames.

In some embodiments, the leading and trailing drive faces of the first and second reciprocating control wheels each have at least one peak position, at least one valley position, and at least two gradual changes that extend between adjacent ones of the peak and valley positions, respectively, wherein the peak and valley positions of the leading drive face are on opposite sides of the valley and peak positions of the trailing drive face.

In some embodiments, the first feeding assembly and the second feeding assembly form one feeding assembly group, the third feeding assembly and the fourth feeding assembly form another feeding assembly group, and the driving rack of one feeding assembly in each feeding assembly group is in contact with the peak position of the corresponding reciprocating control wheel while the driving rack of the other feeding assembly in each feeding assembly group is in contact with the valley position of the corresponding reciprocating control wheel.

In some embodiments, said first and second reciprocating control wheels each have 2K +1 said peak positions and 2K +1 said valley positions on opposite sides thereof, wherein K ∈ N +, N + is a positive set of natural numbers.

In some embodiments, each of said peak locations of one of said two reciprocating control wheels and a tapered surface of the other of said reciprocating control wheels between said peak locations and said valley locations are disposed in axial correspondence with each other.

In some embodiments, the tapered surfaces of the first and second reciprocating control wheels are parabolic curved surfaces.

In some embodiments, during the forward transport of the consumable, at least one of the first feed assembly and the second feed assembly is in the process of forward movement, and at least one of the third feed assembly and the fourth feed assembly is in the process of forward movement.

In some embodiments, during the forward transport of the consumable, two of the first, second, third and fourth feed assemblies are in the process of moving forward and reach a maximum position of forward displacement at a time interval from each other.

In some embodiments, the handheld 3D rendering device has a conveying channel, the first feeding element and the second feeding element are disposed obliquely with respect to the conveying channel, and the first feeding element and the second feeding element are each a blade or are integrally formed with the corresponding first driving rack and the second driving rack.

In some embodiments, the handheld 3D rendering device has a conveying channel, the third feeding element and the fourth feeding element are arranged obliquely with respect to the conveying channel, and the third feeding element and the fourth feeding element are each a blade or are integrally formed with the corresponding third driving rack and the fourth driving rack.

In some embodiments, the reciprocating feeding mechanism further comprises two elastic limiting elements respectively abutting against the first feeding element and the second feeding element, so that the first feeding element and the second feeding element are suitable for keeping elastically contacted with the consumable.

In some embodiments, the reciprocating feeding mechanism further comprises two elastic limiting elements respectively abutting against the third feeding element and the fourth feeding element, so that the third feeding element and the fourth feeding element are suitable for keeping elastically in contact with the consumable.

Drawings

Fig. 1 is a perspective view of a handheld 3D rendering device according to a first preferred embodiment of the present invention.

Fig. 2 is an exploded schematic view of the handheld 3D rendering device according to the above first preferred embodiment of the present invention.

Fig. 3 is a schematic perspective view of the working state of the handheld 3D drawing device according to the first preferred embodiment of the present invention, which is cut along the length direction thereof.

Fig. 4 is a further exploded schematic view of the handheld 3D rendering device according to the above first preferred embodiment of the present invention.

Fig. 5 and 6 are respectively exploded schematic views of a reciprocating feeding mechanism of the handheld 3D rendering device according to the first preferred embodiment of the present invention.

Fig. 7 and 8 are schematic perspective views of a transmission assembly of the reciprocating feeding mechanism of the handheld 3D drawing device according to the first preferred embodiment of the present invention.

Fig. 9 is a schematic structural diagram illustrating a relative position relationship between a feeding element and a consumable in an operating state of the handheld 3D drawing device according to the first preferred embodiment of the present invention.

Fig. 10A and 10B are schematic structural views illustrating the reciprocating feeding mechanism of the handheld 3D mapping device according to the first preferred embodiment of the present invention in an initial state.

Fig. 10C and 10D are schematic structural diagrams illustrating the reciprocating control wheel of the reciprocating feeding mechanism and two driving frames of the handheld 3D mapping device according to the first preferred embodiment of the present invention, when the reciprocating feeding mechanism is in the initial state.

Fig. 11A and 11B are schematic structural diagrams illustrating a first feeding component of the reciprocating feeding mechanism of the handheld 3D drawing device according to the first preferred embodiment of the present invention moving forward to a maximum displacement position and a second feeding component moving backward to a maximum displacement position.

Fig. 11C and 11D are schematic views illustrating the structure of the reciprocating control wheel and the two driving racks in the operating state of the reciprocating feeding mechanism in fig. 11A and 11B.

Fig. 12A and 12B are schematic structural diagrams illustrating the reciprocating feeding mechanism of the handheld 3D drawing device according to the first preferred embodiment of the present invention, when the first feeding assembly moves backward to an intermediate position and the second feeding assembly moves forward to an intermediate position.

Figures 12C and 12D are schematic views illustrating the structure of the reciprocating control wheel and the two driving racks in the operating state of the reciprocating feeding mechanism in figures 12A and 12B.

Fig. 13A and 13B are schematic structural diagrams illustrating the reciprocating feeding mechanism of the handheld 3D drawing device according to the first preferred embodiment of the present invention, in which the first feeding assembly moves backward to the maximum displacement position and the second feeding assembly moves forward to the maximum displacement position.

Figures 13C and 13D are schematic views illustrating the structure of the reciprocating control wheel and the two driving racks in the operating state of the reciprocating feeding mechanism in figures 12A and 12B.

Fig. 14 is a schematic structural diagram illustrating a material returning mechanism of the handheld 3D drawing device according to the first preferred embodiment of the present invention in an initial state.

Fig. 15 is a schematic structural diagram illustrating the material returning mechanism of the handheld 3D drawing device according to the first preferred embodiment of the present invention in a material returning operation state.

Fig. 16 is a schematic structural diagram illustrating that the material returning mechanism of the handheld 3D drawing device according to the first preferred embodiment of the present invention is in a material returning operation state, and the consumable material is drawn out of the conveying pipeline.

Fig. 17 is a schematic perspective view illustrating the material returning mechanism of the handheld 3D drawing device according to the first preferred embodiment of the present invention in an initial state.

Fig. 18 is a schematic perspective view illustrating that the material returning mechanism of the handheld 3D drawing device according to the first preferred embodiment of the present invention is in a material returning operation state, and the consumable material is drawn out of the conveying pipeline.

Fig. 19 is a schematic structural view illustrating the reciprocating feeding mechanism of the hand-held 3D drawing device according to the first modified embodiment of the above first preferred embodiment of the present invention.

Fig. 20 is a schematic structural view illustrating the reciprocating feeding mechanism of the hand-held 3D drawing device according to the second modified embodiment of the above first preferred embodiment of the present invention.

Fig. 21 is a schematic structural view illustrating the reciprocating feeding mechanism of the handheld 3D mapping device according to the third modified embodiment of the first preferred embodiment of the present invention.

Fig. 22 is a schematic structural view illustrating the reciprocating feeding mechanism of the handheld 3D drawing device according to the fourth modified embodiment of the first preferred embodiment of the present invention.

Fig. 23 is an exploded view illustrating a handheld 3D rendering device according to a second preferred embodiment of the present invention.

Fig. 24 is a schematic perspective view of the working state of the handheld 3D rendering device according to the second preferred embodiment of the present invention, taken along the length direction thereof.

Fig. 25 and 26 are respectively exploded views of a reciprocating feeding mechanism of the hand-held 3D drawing device according to the second preferred embodiment of the present invention.

Fig. 27 and 28 are respectively perspective views of a transmission component of the reciprocating feeding mechanism of the handheld 3D drawing device according to the second preferred embodiment of the present invention.

Fig. 29 is a schematic side view of the transmission assembly of the reciprocating feeding mechanism of the handheld 3D mapping device according to the second preferred embodiment of the present invention.

Fig. 30A and 30B are schematic structural views illustrating the reciprocating type feeding mechanism of the handheld 3D mapping device according to the second preferred embodiment of the present invention in an initial state.

Fig. 31A and 31B are schematic structural views illustrating the reciprocating feeding mechanism of the handheld 3D mapping device according to the second preferred embodiment of the present invention when it is in a quarter of the feeding cycle.

Fig. 32A and 32B are schematic structural views illustrating a time of one-half feeding cycle in the reciprocating feeding mechanism of the handheld 3D mapping device according to the second preferred embodiment of the present invention.

Fig. 33A and 33B are schematic structural views illustrating the reciprocating feeding mechanism of the handheld 3D mapping device according to the second preferred embodiment of the present invention in a three-quarter feeding cycle.

Fig. 34A and 34B are schematic structural views illustrating the reciprocating feeding mechanism of the handheld 3D mapping device according to the second preferred embodiment of the present invention at the end of a feeding cycle.

Fig. 35 is a schematic structural diagram illustrating a material returning mechanism of the handheld 3D drawing device according to the second preferred embodiment of the present invention in an initial state.

Fig. 36 is a schematic structural diagram illustrating the material returning mechanism of the handheld 3D drawing device according to the second preferred embodiment of the present invention in a material returning operation state.

Fig. 37 is a schematic structural diagram illustrating that the material returning mechanism of the handheld 3D drawing device according to the second preferred embodiment of the present invention is in a material returning operation state, and the consumable material is drawn out of the conveying pipeline thereof.

Fig. 38 is a schematic perspective view illustrating the material returning mechanism of the handheld 3D drawing device according to the second preferred embodiment of the present invention in an initial state.

Fig. 39 is a schematic perspective view illustrating that the material returning mechanism of the handheld 3D drawing device according to the second preferred embodiment of the present invention is in a material returning operation state, and the consumable material is drawn out of the conveying pipeline.

Fig. 40 and 41 are schematic structural views illustrating the reciprocating feeding mechanism of the handheld 3D drawing device according to the first modified embodiment of the second preferred embodiment of the present invention.

Fig. 42 and 43 are schematic structural views illustrating the reciprocating feeding mechanism of the hand-held 3D drawing device according to the second modified embodiment of the above-described second preferred embodiment of the present invention.

Fig. 44 and 45 are schematic structural views illustrating the reciprocating feeding mechanism of the hand-held 3D drawing device according to the third modified embodiment of the above-described second preferred embodiment of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purpose of limitation.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Fig. 1 to 18 show a hand-held 3D drawing device according to a first preferred embodiment of the present invention, wherein the hand-held 3D drawing device is used to heat and melt a solid consumable 1 to form a 3D drawing material, and includes a drawing main body 10, a reciprocating feeding mechanism 20, and a fusing mechanism 30. The drawing body 10 includes a controller 11 and a hand-held housing 12, a transport channel 13 for transporting the consumable 1 is formed in the hand-held housing 12, the transport channel 13 has an inlet 131 and an outlet 132, the consumable is inserted into the transport channel 13 from the inlet 131 of the transport channel 13, the consumable 1 is transported to the outlet 132 of the transport channel 13 by the reciprocating feeding mechanism 20 under the control of the controller 11, and the 3D drawing material is formed by heating and melting by the heat-melting mechanism 30 under the control of the controller 11, and the 3D drawing material is extruded from the outlet 132 of the transport channel 13 and cooled to form a desired 3D drawing.

Preferably, the outward appearance of handheld casing 12 is the form of a pen, thereby the utility model discloses a handheld 3D draws the device and forms a 3D drawing pen to the convenience of the hand that supplies the user grips and carries out 3D drawing operation. The hand-held housing 12 may include a two-part housing 121, the two-part housing 121 being assembled with each other to form the hand-held housing 12, and an inner cavity 122 being formed between the two-part housing 121 for accommodating the controller 11 and the reciprocating feeding mechanism 20, and the feeding passage 13 for feeding the consumable 1 being formed in the inner cavity 122.

It will be appreciated that the delivery channel 13 may be formed by the hand held housing 12 or may be formed by a separate tube extending into the interior cavity 122 of the hand held housing 12. Referring to fig. 2 to 4, in this embodiment of the present invention, the drawing body 10 includes a conveying pipe 14 for forming a part of the conveying passage 13. The drawing body 10 further includes a head end housing 15. The heat-melting mechanism 30 includes a heating element 31, a heating pipe 32 and a connecting pipe 33, and the heating pipe 32 and the connecting pipe 33 are also used to form part of the conveying passage 13. The head end housing 15 is used for accommodating and assembling the heating pipeline 32, and the heating element 31 is disposed in the heating pipeline 32 to heat the consumable 1 reaching the heating pipeline 32, so as to melt the solid consumable 1 to form the 3D drawing material. The head end housing 15 has a plurality of heat dissipation holes 151 for dissipating heat through the heat dissipation holes 151 when the heating element 31 heats the consumable 1.

The connection pipe 33 is connected to the heating pipe 32, the heating pipe 32 is made of metal to be suitable for heat conduction, and the connection pipe 33 may be made of plastic to prevent the consumable 1 from being melted before reaching the heating pipe 32. The heating duct 32 is intended to form part of said conveying channel 13 and the nozzle at the front end of the heating duct 32 forms said outlet 132 of said conveying channel 13.

As shown in fig. 4 to 6, the drawing body 10 further includes a housing case 16. The delivery pipe 14 is assembled to the housing case 16 and passes through the housing case 16. The receiving housing 16 may also include a two-part housing 161 assembled to form the receiving housing 16, with a receiving cavity 162 formed between the two-part housing 161 for receiving and mounting the reciprocating feed mechanism 20.

As shown in fig. 3 to 6, the delivery pipe 14 includes a first partial pipe 141 and a second partial pipe 142 arranged in a front-to-back manner along the length direction of the handheld housing 12, an inlet end 1411 of the first partial pipe 141 forms the inlet 131 of the delivery passage 13, and an outlet end 1412 of the first partial pipe 141 extends into the accommodating housing 16 to assemble the first partial pipe 141 to the accommodating housing 16. An inlet end 1421 of the second partial duct 142 extends into the containment housing 16. Accordingly, the receiving cavity 162 of the receiving housing 16 is formed with two receiving grooves 1621 for respectively assembling and receiving the outlet end 1412 of the first partial duct 141 and the inlet end 1421 of the second partial duct 142, an outlet end 1422 of which is connected to the connecting duct 33.

A feeding space 1622 is further formed in the accommodating chamber 162 and is respectively communicated with the two accommodating grooves 1621, and the outlet end 1421 of the first partial pipe 141 and the inlet end 1421 of the second partial pipe 142 are spaced apart from each other, so that the feeding space 1622 is located between the outlet end 1421 of the first partial pipe 141 and the inlet end 1421 of the second partial pipe 142, so that after the consumable part 1 passes through the first partial pipe 141 and the second partial pipe 142, a portion of the consumable part 1 corresponding to the feeding space 1622 is exposed at the position of the feeding space 1622, so that the reciprocating feeding mechanism 20 can act on the portion of the consumable part 1 corresponding to the feeding space 1622 to drive the consumable part 1 to move to the outlet 132 of the conveying channel 13 of the drawing body 10.

The consumable 1 is a solid hot melt material, such as PLA (polylactic acid) material or ABS (acrylonitrile butadiene styrene) material, which is extruded from the outlet 132 at the front end of the drawing body 10 after being heated and melted by the hot melt mechanism 30, and forms the 3D product after being cooled. The consumable 1 may be rod-shaped or strip-shaped, preferably, the consumable 1 is circular in cross section, the consumable 1 is cylindrical, and correspondingly, the conveying channel 13 of the drawing main body 10 is also circular to be adapted to the consumable 1.

In this illustrative embodiment of the present invention, the heating element 31 is electrically connected to the controller 11 and heats the consumable 1 by electrical heating. It is understood that the heating element 31 may be a heating resistance wire, a heating film, a Metal Ceramic Heater (MCH), a PTC heater, or the like. The heat-melting mechanism 30 may further include a temperature detector 34 disposed on the heating element 31 for detecting a temperature thereof, thereby facilitating control of the heating operation of the heating element 31 by the controller 11.

As shown in fig. 3 to 8, the reciprocating feeding mechanism 20 includes at least one power source 21, at least one feeding assembly 22 and at least one transmission assembly 23, the feeding assembly 22 is driven by the corresponding transmission assembly 23 to move back and forth under the condition that the power source 21 provides power, and when the feeding assembly 22 moves forward, it acts on the consumable 1 to move the consumable 1 along with the feeding assembly 22 synchronously so as to be conveyed to the outlet 132 in the conveying channel 13.

In this embodiment of the present invention, the reciprocating feeding mechanism 20 comprises a plurality of feeding assemblies 22, each feeding assembly 22 comprises a feeding element 221, each feeding element 221 is driven by the driving assembly 21 to generate a reciprocating displacement, and during the forward movement of each feeding element 221, each feeding element 221 contacts with the surface of the consumable 1, and each feeding element 221 pushes the consumable 1 to move forward, so as to convey the consumable 1 forward.

More specifically, each feeding assembly 22 of the reciprocating feeding mechanism 20 further includes a driving rack 222, and each feeding element 221 is connected to the corresponding driving rack 222, wherein each feeding element 221 can be assembled to the corresponding driving rack 222, or each feeding element 221 is integrally formed with the corresponding driving rack 222.

Referring to fig. 9, each of the feeding elements 221 is arranged in an inclined state with respect to the feeding passage 13 of the drawing body 10. More specifically, each of the feeding members 221 extends obliquely from a connection point position connected to the driving rack 222 toward the side of the outlet 132 of the conveying path 13 to form an acute angle with the conveying path 13. The feeding elements 221 are located around the conveying channel 13, such that when the consumable 1 is inserted into the conveying channel 13, the feeding elements 221 will be located around the consumable 1 to generate a clamping force to the consumable 1 and push the consumable 1 to move forward. In this embodiment of the present invention, the reciprocating feeding mechanism 20 comprises two feeding assemblies 22, wherein two feeding elements 221 of the two feeding assemblies 22 are located on two opposite sides of the conveying channel 13 to generate pushing force to the consumable 1 from two opposite sides.

Each feeding element 221 may be implemented as a blade fixedly connected to the corresponding driving rack 222, and each feeding element 221 has a blade surface 2211, and when the feeding element 221 is driven to move forward, the blade surface 2211 contacts and cuts into the front of the consumable 1 to drive the consumable 1 to move forward. Or each of the feeding elements 221 may be implemented as an elastic piece integrally formed with the corresponding driving rack 222.

When the consumable 1 is driven forward, only the blade face 2211 of the feeding element 221 contacts with the surface of the consumable 1 in a feeding period of the feeding element 221. Like this, reciprocating type feeding mechanism 20 is less relatively with the contact surface of this consumptive material 1 when the handheld 3D drawing device still disposes dyeing mechanism, pay-off component 221 the dyestuff that glues the dyeing on the cutting edge 2211 can be less to when changing the look dyeing operation to this dyeing, can produce less colour interference.

Each of the feeding members 221 is in contact with the consumable 1 while maintaining the above-mentioned tilted state, and when each of the feeding members 221 is driven to move forward, each of the feeding members 221 generates a forward acting force on the consumable, thereby driving the consumable 1 to move forward. In this embodiment of the present invention, when one of the feeding elements 221 is driven to move backward, the backward acting force of the feeding element 221 on the consumable 1 is small, and at least another feeding element 221 is driven to move forward to generate a relatively large forward acting force on the consumable 1, so that during the forward conveying process of the consumable 1, at least one feeding element 221 drives the consumable 1 to move forward all the time.

The power source 21 of the reciprocating feeding mechanism 20 includes a driving motor 211, an output shaft 212, and a power module 213, and the power module 213 may include a rechargeable battery to supply power to the driving motor 211, or the power module 213 may be adapted to be connected to an external power source to convert the power supplied from the external power source into power usable by the handheld 3D drawing device, thereby driving the driving motor 211. The output shaft 212 rotates under the driving action of the driving motor 211 to drive the transmission assembly 23, and the transmission assembly 23 and the driving frame 222 cooperate to convert the rotation of the output shaft 212 into linear movement for driving the driving frame 222.

The controller 11 includes a control circuit board 111 and a control switch 112, and the control circuit board 11 is electrically connected to the power module 213 and the driving motor 211 for controlling the driving motor 211 to be turned on and off and adjusting the rotation speed of the driving motor 211. The control switch 112 is disposed on the hand-held housing 12 to facilitate control operation by a user.

The receiving cavity 162 of the receiving housing 16 further has an assembling groove 1623 for receiving and mounting the driving motor 211 of the power source 21 of the reciprocating feeder 20. The feeding space 1622 formed in the accommodating cavity 162 of the accommodating housing 16 is also implemented as a sliding slot for allowing and limiting the sliding displacement of the two driving racks 222.

Referring to fig. 5 to 8, the driving assembly 23 includes a connecting member 231 and a reciprocating control wheel 232, the connecting member 231 is connected to the output shaft 212 of the power source 21, the reciprocating control wheel 232 is connected to the connecting member 231, so that the reciprocating control wheel 232 can synchronously rotate when the connecting member 231 rotates along with the output shaft 212, and the reciprocating control wheel 232 is used for driving the driving frame 222 to reciprocate so as to further drive the feeding member 221 to reciprocate back and forth.

Each of the driving racks 222 includes a front side action surface 2221 and a rear side action surface 2222 spaced apart from each other to form a action groove 2223 therebetween, the front side action surface 2221 refers to an action surface on a side closer to the outlet 132 of the conveying path 13 of the drawing body 10, and the rear side action surface 2222 and the front side action surface 2221 are located on opposite sides of the action groove 2223. The reciprocating control wheel 232 is implemented as a wheel-shaped component protruding from the connecting element 231 and extending in the circumferential direction in this embodiment, and includes a front driving surface 2321 and a rear driving surface 2322 on opposite sides, the front driving surface 2321 of the reciprocating control wheel 232 can act on the front acting surface 2221 of the corresponding driving frame 222, and the rear driving surface 2322 of the reciprocating control wheel 232 can act on the rear acting surface 2222 of the corresponding driving frame 222.

The front driving surface 2321 of the reciprocation control wheel 232 is a curved surface, and a partial portion thereof extends into the reaction groove 2223, so that when the reciprocation control wheel 232 rotates, each position of the front driving surface 2321 of the reciprocation control wheel 232 is periodically rotated into the reaction groove 2223, so that each position of the curved surface of the front driving surface 2321 periodically reacts with the corresponding front reaction surface 2221 of the drive carrier 222.

The rear driving surface 2322 of the reciprocating control wheel 232 is also curved and a partial portion thereof extends into the reaction slot 2223 such that as the reciprocating control wheel 232 rotates, the respective positions of the rear driving surface 2322 of the reciprocating control wheel 232 are periodically rotated into the reaction slot 2223 such that the respective positions of the curved surface of the rear driving surface 2322 periodically interact with the corresponding rear reaction surface 2222 of the drive carrier 222.

The front driving surface 2321 of the reciprocating control wheel 232 can act on the front acting surface 2221 of the corresponding driving frame 222, so that the reciprocating control wheel 232 pushes the front acting surface 2221 of the corresponding driving frame 222 through the front driving surface 2321 to drive the corresponding driving frame 222 to move forwards. The rear driving surface 2322 of the reciprocating control wheel 232 can act on the rear acting surface 2221 of the corresponding driving frame 222, so that the reciprocating control wheel 232 pushes the rear acting surface 2222 of the corresponding driving frame 222 through the rear driving surface 2322 to drive the corresponding driving frame 222 to move backwards. In this way, the reciprocating control wheel 232 can drive the corresponding driving rack 222 to reciprocate, so that the driving rack 222 drives the feeding element 221 connected with the driving rack to reciprocate together.

The front driving surface 2321 of the reciprocating control wheel 232 has at least one peak position 23211, at least one valley position 23212, and a gradually changing surface 23213 extending between the adjacent peak position 23211 and the valley position 23212, and the gradually changing surface 23213 is an arc-shaped curved surface or an inclined surface. When the power source 21 drives the reciprocating control wheel 232 to rotate, the positions of the front driving surfaces 2321 alternately contact with the front acting surfaces 2221 of the corresponding driving frames 222 to drive the corresponding driving frames 222 to move, and when the peak position 23211 of the front driving surface 2321 contacts with the front acting surface 2221 of the corresponding driving frame 222, the corresponding driving frame 222 moves forward to a maximum distance to drive the corresponding feeding element 221 to move forward to a maximum distance. When the valley point 23212 of the front driving surface 2321 contacts the rear acting surface 2222 of the corresponding driving rack 222, the corresponding driving rack 222 moves backward to a maximum distance, and the corresponding feeding element 221 moves backward to a maximum distance.

The rear driving surface 2322 of the reciprocating control wheel 232 has at least one peak position 23221, at least one valley position 23222, and a gradually changing surface 23223 extending between the adjacent peak position 23221 and the valley position 23222, and the gradually changing surface 23223 is an arc-shaped curved surface or an inclined surface. When the power source 21 drives the reciprocating control wheel 232 to rotate, each position of the rear driving surface 2321 alternately contacts with the rear acting surface 2222 of the corresponding driving frame 222 to drive the corresponding driving frame 222 to move, when the peak position 23221 of the rear driving surface 2322 contacts with the rear acting surface 2222 of the corresponding driving frame 222, the corresponding driving frame 222 is driven to move backwards to a maximum distance, the corresponding feeding element 221 moves backwards to a maximum distance, and when the valley position 23222 of the rear driving surface 2322 contacts with the rear acting surface 2222 of the corresponding driving frame 222, the corresponding driving frame 222 moves forwards to a maximum distance, and at this time, the feeding element 221 moves forwards to a maximum distance.

It should be noted that each of the gradually-changing surfaces 23213 and 23223 is preferably developed to be a parabolic curved surface, so that when the reciprocating control wheel 232 drives each of the corresponding driving frames 222, each of the driving frames 222 generates a constant-acceleration motion, so that the constant-acceleration motion is more beneficial to avoid a rigid impact than a constant-speed motion generated by each of the driving frames 222 due to an oblique straight line surface, and has advantages of a small starting moment and a large load.

The peak position 23211 of the front driving surface 2321 of the reciprocation control wheel 232 is located on opposite sides of the reciprocation control wheel 232 corresponding to the valley position 23222 of the rear driving surface 2322. The valley position 23212 of the front driving surface 2321 of the reciprocation control wheel 232 is located on opposite sides of the reciprocation control wheel 232 corresponding to the peak position 23221 of the rear driving surface 2322.

The front driving surface 2321 of the reciprocating control wheel 232 acts on the front acting surface 2221 of the corresponding driving frame 222 to push the corresponding driving frame 222 to move forward and when the peak position 23211 of the front driving surface 2321 of the reciprocating control wheel 232 moves to be able to act on the front acting surface 2221 of the corresponding driving frame 222, at this time, the valley position 23222 of the rear driving surface 2322 of the reciprocating control wheel 232 moves to be in contact with the rear acting surface 2222 of the corresponding driving frame 222, at this time, the corresponding driving frame 222 moves to the maximum displacement forward, and the corresponding feeding element 221 also moves and drives the consumable 1 to move to the maximum displacement forward.

The rear driving surface 2322 of the reciprocating control wheel 232 acts on the rear acting surface 2222 of the corresponding driving frame 222 to push the corresponding driving frame 222 to move backwards and when the peak position 23221 of the rear driving surface 2322 of the reciprocating control wheel 232 moves to be capable of acting on the rear acting surface 2222 of the corresponding driving frame 222, at this time, the valley position 23212 of the front driving surface 2321 of the reciprocating control wheel 232 moves to be in contact with the front acting surface 2221 of the corresponding driving frame 222, at this time, the corresponding driving frame 222 moves to the maximum displacement in the backward direction, and the corresponding feeding element 221 also moves to the maximum displacement in the backward direction to prepare for entering the next feeding period 2221.

One feeding cycle is completed after each of the feeding elements 221 moves forward and backward to the maximum distance, respectively, and each of the feeding elements 221 continuously moves forward and backward reciprocally to drive the consumable part 1 to move forward by repeating the feeding cycle.

In this embodiment of the present invention, the reciprocating control wheel 232 drives two feeding assemblies 22 to reciprocate simultaneously, so as to drive two feeding elements 221 to reciprocate. That is, the driving motor 211 of the power source 21 provides a power supply for the reciprocating movement of the two feeding assemblies 22, and when it is activated, the reciprocating control wheel 232 is driven to rotate to drive the two feeding assemblies 22. A partial portion of the reciprocation control wheel 232 extends into the action groove 223 of one of the drive frames 222, and a partial portion extends into the action groove of the other of the drive frames 222, so that the reciprocation control wheel 232 can be used to drive both of the drive frames 222, thereby further enabling the reciprocation of both of the feed members 221.

More specifically, referring to fig. 10A to 13D, the two feeding assemblies 22 include a first feeding assembly 22a and a second feeding assembly 22b, the first feeding assembly 22a includes a first feeding element 221a and a first driving rack 222a, and the second feeding assembly 22b includes a second feeding element 221b and a second driving rack 222b. When the driving motor 211 works, the reciprocating control wheel 232 drives the first feeding assembly 22a and the second feeding assembly 22b to reciprocate, so as to drive the first feeding element 221a and the second feeding element 221b to reciprocate, and respectively drive the consumable part 1 to move forward.

Accordingly, the first driving bracket 222a includes a first front acting surface 2221a and a first rear acting surface 2222a and has a first acting groove 2223a, and the second driving bracket 222b includes a second front acting surface 2221b and a second rear acting surface 2222b and has a second acting groove 2223b.

The first feeding member 221a and the second feeding member 221b may be driven to simultaneously move forward and simultaneously move backward. In this embodiment, the first feeding unit 221a and the second feeding unit 221b alternately move forward to drive the consumable 1 to move forward. That is, when the first feeding unit 221a moves forward to drive the consumable part 1 to move forward, the second feeding unit 221b moves backward, and when the second feeding unit 221b moves forward to drive the consumable part 1 to move forward, the first feeding unit 221a moves backward, so that during the forward transport of the consumable part 1, one feeding unit 221 is kept moving forward to drive the consumable part 1 to move forward.

As shown in fig. 10A to 10D, when the consumable 1 is inserted into the conveying path 13, the two feeding assemblies 22 are in the initial state, and the driving motor 211 is not yet activated, the two feeding elements 221 are respectively in contact with the consumable 1, and the middle positions of the two gradually-changing surfaces 23213 of the front driving surface 2321 of the reciprocating control wheel 232 are respectively located in the first acting slot 2223a and the second acting slot 2223b to be in contact with the first front acting surface 2221a of the first driving rack 222a and the second front acting surface 2221b of the second driving rack 222b. The intermediate positions of the two gradually changing surfaces 23223 of the rear driving surface 2322 of the reciprocating control wheel 232 are located in the first and second reaction grooves 2223a and 2223b, respectively, to be in contact with the first rear reaction surface 2222a of the first driving frame 222a and the second rear reaction surface 2222b of the second driving frame 222b.

When the driving motor 211 is started, as shown in fig. 11A to 11D, the contact position between the front driving surface 2321 of the reciprocating control wheel 232 and the first front acting surface 2221A of the first driving frame 222a is changed from the gradually-changing surface 23213 to one peak position 23211 of the front driving surface 2321 of the reciprocating control wheel 232, and the contact position between the rear driving surface 2322 of the reciprocating control wheel 232 and the first rear acting surface 2222a of the first driving frame 222a is changed from the gradually-changing surface 23223 to one valley position 23222 of the rear driving surface 2322 of the reciprocating control wheel 232, so that the front driving surface 2321 of the reciprocating control wheel 232 exerts an urging force on the first front acting surface 2321A of the first driving frame 222a to drive the first driving frame 222a to reach a maximum feeding displacement position for driving the first consumable element 221A to move forward, thereby driving the consumable element 221A to move forward.

At this stage, the contact position between the rear driving surface 2322 of the shuttle wheel 232 and the second rear acting surface 2222b of the second driving frame 222b is changed from the gradient surface 23223 to one peak point position 23221 of the rear driving surface 2322 of the shuttle wheel 232, and the contact position between the front driving surface 2321 of the shuttle wheel 232 and the second front acting surface 2221b of the second driving frame 222b is changed from the gradient surface 23213 to one valley point position 23212 of the front driving surface 2321 of the shuttle wheel 232, so that the rear driving surface 2322 of the shuttle wheel 232 applies an urging force to the second rear acting surface 2222b of the second driving frame 222b to drive the second driving frame 222b to move backward until reaching a maximum displacement position of backward movement.

As shown in fig. 12A to 12D, the driving motor 211 continues to operate, and the positions on the two gradually changing surfaces 23213 of the front driving surface 2321 of the reciprocation control wheel 232 are rotated into the first operating groove 2223a and the second operating groove 2223b, respectively, to contact the first front operating surface 2221a of the first driving frame 222A and the second front operating surface 2221b of the second driving frame 222b. The positions on the two gradually-changing surfaces 23223 of the rear driving surface 2322 of the reciprocating control wheel 232 are rotated into the first acting groove 2223a and the second acting groove 2223b, respectively, to contact with the first rear acting surface 2222a of the first driving frame 222a and the second rear acting surface 2222b of the second driving frame 222b, until the first driving frame 222a and the second driving frame 222b return to the initial state, at which time the first driving frame 222a moves backwards to drive the first feeding element 221a to move backwards, and the second driving frame 222b moves forwards to drive the second feeding element 221b to move forwards, so that the second feeding element 221b drives the consumable 1 to move forwards at this stage.

As shown in fig. 13A to 13D, the contact position of the front driving surface 2321 of the reciprocating control wheel 232 with the first front acting surface 2221a of the first drive carrier 222a changes from the gradually changing surface 23213 to one valley point position 23211 of the front driving surface 2321 of the reciprocating control wheel 232, and the contact position of the rear driving surface 2322 of the reciprocating control wheel 232 with the first rear acting surface 2222a of the first drive carrier 222a changes from the gradually changing surface 23223 to one peak point position 23222 of the rear driving surface 2322 of the reciprocating control wheel 232, so that the rear driving surface 2322 of the reciprocating control wheel 232 exerts an urging force on the first rear acting surface 2222a of the first drive carrier 222a to drive the first drive carrier 222a to move backward until it reaches a maximum displacement position for backward movement.

At this stage, the contact position between the rear driving surface 2322 of the shuttle wheel 232 and the second rear acting surface 2222b of the second driving frame 222b is changed from the gradually-changing surface 23223 to a valley position 23221 of the rear driving surface 2322 of the shuttle wheel 232, and the contact position between the front driving surface 2321 of the shuttle wheel 232 and the second front acting surface 2221b of the second driving frame 222b is changed from the gradually-changing surface 23213 to a peak position 23212 of the front driving surface 2321 of the shuttle wheel 232, so that the front driving surface 2321 of the shuttle wheel 232 applies an urging force to the second front acting surface 2221b of the second driving frame 222b to drive the second driving frame 222b to move forward until reaching a maximum displacement position of forward movement, so that the second feeding element 221b is displaced forward to a maximum distance and drives the consumable 1 to move forward.

Then, the second feeding member 221b enters a backward movement process, and the first feeding member 221a enters a forward movement process. Repeating the above steps, the first feeding unit 221a and the second feeding unit 221b are alternately driven to move forward to drive the consumable part 1 to move forward, thereby ensuring that the consumable part 1 can be continuously conveyed forward.

In addition, referring to fig. 5 to 6 and 14 to 18, in this embodiment, each of the driving racks 222 has a mounting groove 2224 for mounting the corresponding feeding element 221 and keeping the feeding element 221 in contact with the consumable 1 obliquely. Each feeding assembly 22 further includes an elastic limiting member 223, one end of which is connected to the corresponding driving rack 222, and the other end of which abuts against the corresponding feeding element 221, so as to keep the feeding element 221 in contact with the consumable 1.

It is worth mentioning that the mounting groove 2224 and the elastic limit piece 223 of the driving rack 222 allow the feeding element 221 to have a space that pivots slightly, each of the present invention discloses that the feeding element 221 is arranged to keep elastically contacting with the consumable 1, thereby in the material loading preparation phase of the handheld 3D drawing device of the present invention, allowing to insert the front end of the consumable 1 into the conveying channel 13 of the drawing main body 10 and push the feeding element 221 away until the front end of the consumable 1 can be directly pushed to the position of the hot melting mechanism 30, during which the elastic limit piece 223 is compressed and automatically reset to drive the feeding element 221 back to the initial position and keep contacting with the consumable 1 after the material loading preparation of the consumable 1 is completed.

In addition, the conventional gear or thread feeding mechanism has strict requirements on the diameter tolerance of the consumable 1. However, in the present invention, since each of the feeding elements 221 is arranged to keep elastically in contact with the consumable 1, the requirement of the handheld 3D drawing device for the diameter tolerance of the consumable 1 is reduced. That is, when the diameter tolerance of the consumable 1 is large, the feeding element 221 can still effectively engage the consumable 1 to drive the consumable 1 to move forward.

Referring to fig. 14 to 18, in this embodiment of the present invention, the handheld 3D drawing device further includes a material returning mechanism 40, which is a mechanical structure to facilitate the material returning operation of the consumable 1. Specifically, the material returning mechanism 40 includes a material returning switch 41, a transmission member 42 connected to the material returning switch 41, and a pushing member 43 connected to the transmission member 42, wherein the material returning switch 41 is disposed on the handheld housing 12 for a user to operate. In the initial state, the pushing member 43 is spaced from the two feeding elements 221, and when the material returning switch 41 is operated to slide, the transmission member 42 is driven to move, so that the pushing member 43 is driven to move to contact with the two feeding elements 221 and push the two feeding elements 221 to separate the two feeding elements 221 from the consumable material 1. In this way, as shown in fig. 16 and 18, the user can directly extract the front end of the consumable 1 from the position of the hot-melt mechanism 30 out of the hand-held 3D drawing device along the transport path 13 of the drawing body 10, during which the two feed elements 221 do not block the extraction operation of the consumable 1.

In addition, the material discharging mechanism 40 may further include an elastic member 44 connected to the pushing member 43 and fixed to the receiving case 16, the elastic member 44 is deformed to allow the pushing member 43 to move when the material discharging switch 41 is operated to slide. And when the material returning switch 41 is released, the elastic element 44 automatically resets to drive the pushing component 43 to reset.

It is worth mentioning that when the pushing part 43 of the material returning mechanism 40 abuts and pushes the two feeding elements 221, it is also possible to allow the consumable part 1 to be directly inserted from the conveying channel 13 of the drawing body 10 and to convey the front end thereof to the position of the heat fusing mechanism 30 without being blocked by the two feeding elements 221.

Therefore, the handheld 3D drawing device of the present invention allows for a fast loading preparation of this consumable 1. Therefore, unlike the conventional gear or thread feeding mechanism in which the gear or thread blocks the consumable 1, an additional starting wheel or thread feeding mechanism must be operated to push the consumable 1 to push the front end of the consumable 1 to the heating position. Handheld 3D draws device allows quick material returned in order to take out this consumptive material 1 to need not set up the silk motor that advances that can just reverse in traditional gear or the thread tooth advances silk mechanism.

As shown in fig. 19, a first variant of the handheld 3D drawing device according to the above first preferred embodiment of the present invention is provided, in this embodiment, the reciprocating feeding mechanism 20 includes two reciprocating control wheels 232, each reciprocating control wheel 232 is used for driving one driving rack 222 to reciprocate, and a plurality of driving racks 222 may be arranged in tandem along the length direction of the drawing main body 10 of the handheld 3D drawing device. Unlike the first embodiment described above, it is desirable that the two drive carriages 222 be arranged side-by-side to align their reaction slots 2223 with the reciprocating control wheels 232. In this case, the front driving surface 2321 and the rear driving surface 2322 of each of the two reciprocating control wheels 232 may be designed to interact with the corresponding driving rack 222, so that the feeding periods of the two driving racks 222 are staggered. For example, a half feed cycle or a quarter feed cycle may be staggered, etc.

As shown in fig. 20, in a second variant of the handheld 3D drawing device according to the above first preferred embodiment of the present invention, in this embodiment, the reciprocating feeding mechanism 20 includes two driving motors 211 and two reciprocating control wheels 232, each reciprocating control wheel 232 is driven by the corresponding driving motor 211 to drive one driving rack 222 to reciprocate, and a plurality of driving racks 222 may be located on two opposite sides of the conveying channel 13 of the drawing main body 10. The rotation speeds of the two driving motors 211 may be the same or different, so that the two driving racks 222 may move synchronously to drive the consumable 1 to move forwards at the same time. The two driving racks 222 may also be reciprocally displaced at different speeds, so that the time lengths of the feeding periods of the two feeding elements 221 are different, thereby ensuring that the consumable article 1 is continuously driven by one feeding element 221 to move forward.

In addition, in this embodiment, the two driving racks 222 may be formed with a limiting member 224 at the front end for passing through the accommodating housing 16, so that the limiting member 224 limits and guides the reciprocating movement of the two driving racks 222.

As shown in fig. 21, a third variant of the handheld 3D rendering device according to the first preferred embodiment of the present invention is provided, in which each driving frame 222 and the corresponding feeding element 221 are integrally formed, and each feeding element 221 may be implemented as an elastic sheet. This eliminates the need for an additional assembly step of the driving bracket 222 and the corresponding feeding member 221.

Fig. 22 shows a fourth variant of the handheld 3D rendering device according to the first preferred embodiment of the present invention, in this embodiment, the reciprocating feeding mechanism 20 includes a driving assembly 24, the driving assembly 24 includes a forward driving device 241 and a backward driving device 242, the forward driving device 241 is used for driving two feeding assemblies 22 to move forward, and the backward driving device 242 is used for driving two feeding assemblies 22 to move backward.

In this embodiment, the advancing driving means 241 is implemented to include the power source 21 and the transmission assembly 23, the reciprocating control wheel 232 only has the front driving surface 2321, but may not have the rear driving surface 2322, and when the driving motor 211 of the power source 21 is operated, the two feeding assemblies 22 are driven to move forward by the front driving surface 2321 of the reciprocating control wheel.

The backward driving device 242 is used to drive the backward returning movement of the two feeding assemblies 22. For example, in this embodiment, the backward driving device 242 is implemented to include two springs 2421, one end of each spring 2421 is connected to the driving motor 211 or the accommodating housing 16, and the other end is connected to the corresponding driving rack 222, so as to implement the backward returning of the corresponding driving rack 222.

That is, in the first embodiment, the two feed assemblies 22 are driven to reciprocate by the cam structures on both sides of the same reciprocating control wheel 232. In this embodiment, however, the forward and rearward movement of the two feed assemblies 22 may be achieved by different drive mechanisms.

As shown in fig. 23 to 39, a hand-held 3D drawing device according to a second preferred embodiment of the present invention includes a drawing main body 10, a reciprocating feeding mechanism 20, and a fusing mechanism 30. Accordingly, the drawing body 10 includes a controller 11 and a hand-held housing 12, a transport path 13 for transporting the consumable 1 is formed in the hand-held housing 12, the transport path 13 has an inlet 131 and an outlet 132, the consumable is inserted into the transport path 13 from the inlet 131 of the transport path 13, the consumable 1 is transported to the outlet 132 of the transport path 13 by the reciprocating feeding mechanism 20 under the control of the controller 11, and is heated and melted by the heat-melting mechanism 30 under the control of the controller 11 to form the 3D drawing material, and the 3D drawing material is extruded from the outlet 132 of the transport path 13 and is cooled to form the desired 3D drawing work.

As shown in fig. 23 to 26, the drawing body 10 includes a delivery duct 14 for forming part of the delivery passage 13. The drawing body 10 further includes a head end housing 15. The heat-melting mechanism 30 includes a heating element 31, a heating pipe 32 and a connecting pipe 33, and the heating pipe 32 and the connecting pipe 33 are also used to form part of the conveying passage 13. The drawing body 10 further includes a containing case 16. The delivery pipe 14 is assembled to the housing case 16 and passes through the housing case 16. The delivery conduit 14 includes a first portion 141 and a second portion 142 arranged in tandem along the length of the hand held housing 12. Accordingly, the accommodating chamber 162 of the accommodating case 16 is formed with two accommodating grooves 1621 for respectively assembling and accommodating an outlet end 1412 of the first partial pipe 141 and an inlet end 1421 of the second partial pipe 142.

In this embodiment, the reciprocating feeding mechanism 20 includes a power source 21, four feeding assemblies 22 and a transmission assembly 23, under the condition that the power source 21 provides power, the four feeding assemblies 22 are driven by the corresponding transmission assemblies 23 to move reciprocally, and when each feeding assembly 22 moves forwards, the feeding assembly acts on the consumable 1 to move the consumable 1 along with the feeding assembly 22 synchronously so as to be conveyed to the outlet 132 in the conveying channel 13. Two feeding spaces 1622 are formed in the accommodating cavity 162, and are correspondingly used for accommodating and limiting the sliding tracks of the two groups of feeding assemblies 22 and providing spaces for the four feeding assemblies 22 to act on the consumable 1.

Each of the feeding assemblies 22 includes a feeding member 221 and a driving rack 222, and the feeding member 221 and the driving rack 222 are similar in structure to those of the first embodiment described above. And each of the feeding assemblies 22 in this embodiment also includes an elastic stopper 223 having elasticity and integrally formed with the corresponding driving frame 222. Also, in the first embodiment, the elastic stoppers 223 implemented as springs are located in front of the corresponding feeding elements 221 and extend along the length direction of the handheld 3D rendering device. In this embodiment, each of the elastic stoppers 223 extends along the width direction of the handheld 3D drawing device and the inner end thereof is pressed against the corresponding feeding element 221, so that the corresponding feeding element 221 is kept in elastic contact with the consumable 1.

The power source 21 of the reciprocating feeding mechanism 20 includes a driving motor 211, an output shaft 212 and a power module 213, the output shaft 212 rotates under the driving action of the driving motor 211 to drive the transmission assembly 23, and the transmission assembly 23 and the driving frame 222 cooperate to convert the rotation of the output shaft 212 into the linear movement to drive the driving frame 222. The controller 11 includes a control circuit board 111 and a control switch 112, and the control circuit board 11 is electrically connected to the power module 213 and the driving motor 211 for controlling the on/off of the driving motor 211 and adjusting the rotation speed of the driving motor 211. The control switch 112 is disposed on the hand-held housing 12 to facilitate control operation by a user.

The receiving cavity 162 of the receiving housing 16 further has an assembling groove 1623 for receiving and mounting the driving motor 211 of the power source 21 of the reciprocating feeder 20. The feeding space 1622 formed in the accommodating cavity 162 of the accommodating housing 16 is also implemented as a sliding groove for allowing and limiting the sliding displacement of the two driving brackets 222.

As shown in fig. 27 to 29, the driving assembly 23 includes a connecting member 231 and two reciprocating control wheels 232, the connecting member 231 includes two connecting members 2311, one of the connecting members 2311 is connected to the output shaft 212 of the power source 21, the other connecting member 2311 is connected to the previous connecting member 2311, the two reciprocating control wheels 232 are connected to the connecting member 231, more specifically, the two reciprocating control wheels 232 are respectively connected to the two connecting members 2311, so that the two reciprocating control wheels 232 can synchronously rotate when the connecting member 231 rotates along with the output shaft 212, and the two reciprocating control wheels 232 are used for driving the four driving frames 222 to reciprocate to further drive the four feeding elements 221 to reciprocate. It will be appreciated that in another variant embodiment, the connecting element 231 may also be a single integral element on which the two reciprocating control wheels 232 are mounted.

In this embodiment, two of the feed assemblies 22 form a single set of feed assemblies 22, and the reciprocating feed mechanism 20 in this embodiment includes two sets of the feed assemblies 22. One of the reciprocating control wheels 232 is used to drive one set of the feed assemblies 22, i.e., one of the reciprocating control wheels 232 is used to drive two of the feed assemblies 22.

As shown in fig. 25 to 29, each of the driving brackets 222 includes a front side acting surface 2221 and a rear side acting surface 2222 spaced apart from each other to form an acting slot 2223 therebetween. Each of the reciprocating control wheels 232 includes a front driving surface 2321 and a rear driving surface 2322 on opposite sides, and the front driving surface 2321 of the reciprocating control wheel 232 and the rear driving surface 2322 of the reciprocating control wheel 232 are both curved surfaces, a partial portion of which extends into the two reaction slots 2223 of the two driving frames 222 of one set of the feed assembly 22, such that when the reciprocating control wheel 232 rotates, each position of the front driving surface 2321 of the reciprocating control wheel 232 is periodically rotated into the two reaction slots 2223, such that each position of the curved surface of the front driving surface 2321 periodically interacts with the front reaction surfaces 2221 of the corresponding two driving frames 222. Each position of the rear driving surface 2322 of the reciprocating control wheel 232 is also periodically rotated into the two reaction grooves 2223 so that each position of the curved surface of the rear driving surface 2322 periodically reacts with the corresponding rear reaction surfaces 2222 of the two driving frames 222.

Similar to the first embodiment, the front driving surface 2321 of the reciprocating control wheel 232 has at least one peak position 23211, at least one valley position 23212, and a gradually changing surface 23213 extending between the adjacent peak position 23211 and valley position 23212, wherein the gradually changing surface 23213 is an arc-shaped curved surface or an inclined surface. The rear driving surface 2322 of the reciprocating control wheel 232 has at least one peak position 23221, at least one valley position 23222, and a gradually changing surface 23223 extending between the adjacent peak position 23221 and the valley position 23222, and the gradually changing surface 23223 is an arc-shaped curved surface or an inclined surface. The peak position 23211 of the front driving surface 2321 of the reciprocation control wheel 232 is located on opposite sides of the reciprocation control wheel 232 corresponding to the valley position 23222 of the rear driving surface 2322. The valley position 23212 of the front driving surface 2321 of the reciprocation control wheel 232 is located on opposite sides of the reciprocation control wheel 232 corresponding to the peak position 23221 of the rear driving surface 2322.

In this embodiment of the present invention, two of the reciprocating control wheels 232 simultaneously drive four of the feeding assemblies 22 to reciprocate, so as to drive four of the feeding elements 221 to reciprocate. That is, the driving motor 211 of the power source 21 provides a power supply for the reciprocating movement of the four feeding assemblies 22, and when being started, the two reciprocating control wheels 232 are driven to rotate so as to drive the four feeding assemblies 22. A partial portion of one of the reciprocating control wheels 232 on the front side extends into the action groove 223 of one of the drive frames 222 of a front set of the feeder assemblies 22, and a partial portion extends into the action groove of the other of the drive frames 222 of the front set of the feeder assemblies 22, so that the reciprocating control wheel 232 on the front side can be used to drive both of the drive frames 222 on the front side, and further can drive the reciprocating movement of both of the feeder elements 221 on the front side. A partial portion of one of the reciprocating control wheels 232 on the rear side extends into the action groove 223 of one of the drive frames 222 of the rear set of the feeder assemblies 22, and a partial portion extends into the action groove of the other of the drive frames 222 of the rear set of the feeder assemblies 22, so that the reciprocating control wheel 232 on the rear side can be used to drive the two drive frames 222 on the rear side, and further can drive the reciprocating movement of the two feeder elements 221 on the rear side.

It is worth mentioning that in this embodiment, preferably, two of the reciprocating control wheels 232 each have 2k +1 of the peak positions 23211 and 2k +1 of the valley positions 23212 on the front side thereof and 2k +1 of the peak positions 23221 and 2k +1 of the valley positions 23222 on the rear side thereof, where K ∈ N +, N + is a positive natural number set. For example, in this embodiment, each of the two reciprocating control wheels 232 has 3 peak positions 23211, 3 valley positions 23212, and 6 gradient surfaces 23213 on the front side thereof, and 3 peak positions 23221, 3 valley positions 23222, and 6 gradient surfaces 23223 on the rear side thereof. This ensures that the front peak position 23211 and the rear peak position 23222 of one of the reciprocating control wheels 232 are located on opposite sides, the front valley position 23212 and the rear peak position 23221 of one of the reciprocating control wheels 232 are located on opposite sides, and the driving motor 211 is operated to rotate each of the reciprocating control wheels 232 for one revolution to complete multiple feeding cycles of the feeding assembly 22.

More specifically, as shown in fig. 30A-34B, the two reciprocating control wheels 232 include a first reciprocating control wheel 232a on the front side and a second reciprocating control wheel 232B on the rear side, and the four feed assemblies 22 include a first feed assembly 22a, a second feed assembly 22B, a third feed assembly 22c and a fourth feed assembly 22d. Wherein the first feeding assembly 22a and the second feeding assembly 22b constitute a first group of feeding assemblies 22a and 22b located at the front side, and the third feeding assembly 22c and the fourth feeding assembly 22d constitute a second group of feeding assemblies 22c and 22d located at the rear side. The first feeding assembly 22a includes a first feeding element 221a and a first driving rack 222a, the second feeding assembly 22b includes a second feeding element 221b and a second driving rack 222b, the third feeding assembly 22c includes a third feeding element 221c and a third driving rack 222c, and the fourth feeding assembly 22d includes a fourth feeding element 221d and a fourth driving rack 222d. When the driving motor 211 is in operation, the first reciprocating control wheel 232a located at the front side drives the first feeding assembly 22a and the second feeding assembly 22b to reciprocate, so as to drive the first feeding element 221a and the second feeding element 221b to reciprocate, so as to respectively drive the consumable item 1 to move forward, and the second reciprocating control wheel 232b located at the rear side drives the third feeding assembly 22c and the fourth feeding assembly 22d to reciprocate, so as to drive the third feeding element 221c and the fourth feeding element 221d to reciprocate, so as to respectively drive the consumable item 1 to move forward.

Accordingly, the first driving bracket 222a includes a first front acting surface 2221a and a first rear acting surface 2222a and has a first acting groove 2223a, and the second driving bracket 222b includes a second front acting surface 2221b and a second rear acting surface 2222b and has a second acting groove 2223b. The third driving rack 222c includes a third front acting surface 2221c and a third rear acting surface 2222c and has a third acting groove 2223c, and the fourth driving rack 222d includes a fourth front acting surface 2221d and a fourth rear acting surface 2222d and has a fourth acting groove 2223d. The first reciprocating control wheel 232a includes a front driving surface 2321a and a rear driving surface 2322a, and the second reciprocating control wheel 232b includes a front driving surface 2321b and a rear driving surface 2322b. Each of the driving surfaces 2321a, 2322a, 2321b, 2322b is a curved surface.

In this embodiment, said first feeding element 221a and said second feeding element 221b are driven by said first reciprocating control wheel 232a to alternately move forward to drive the consumable part 1 to move forward. The third feeding unit 221c and the fourth feeding unit 221d are driven by the second shuttle wheel 232b to alternately move forward to drive the consumable part 1 to move forward. That is, when the first feeding element 221a moves forward to drive the consumable part 1 to move forward, the second feeding element 221b moves backward, when the second feeding element 221b moves forward to drive the consumable part 1 to move forward, the first feeding element 221a moves backward, when the third feeding element 221c moves forward to drive the consumable part 1 to move forward, the fourth feeding element 221d moves backward, when the fourth feeding element 221d moves forward to drive the consumable part 1 to move forward, the third feeding element 221c moves backward, so that during the forward conveying of the consumable part 1, one or two feeding elements 221 are kept moving forward to drive the consumable part 1 to move forward.

As shown in fig. 30A to 30B, when the consumable 1 is inserted into the conveying path 13, the four feeding assemblies 22 are in the initial state, and the driving motor 211 is not yet activated, the four feeding elements 221 are respectively in contact with the consumable 1, and the intermediate positions of the two tapered surfaces 23213a of the front driving surface 2321a of the first reciprocating control wheel 232a located at the front side are respectively located in the first acting groove 2223a and the second acting groove 2223B and are in contact with the first front acting surface 2221a of the first driving rack 222a and the second front acting surface 2221B of the second driving rack 222B. The intermediate positions of the two tapered surfaces 23223a of the rear driving surface 2322a of the first reciprocating control wheel 232a are located in the first and second working grooves 2223a and 2223b, respectively, to be in contact with the first rear working surface 2222a of the first driving frame 222a and the second rear working surface 2222b of the second driving frame 222b. I.e. in the initial state, the two said feeder assemblies 22a and 22b, which are located at the front side, are located in an intermediate position between their maximum displacement positions forwards and backwards.

A valley position 23212b of the front driving surface 2321b of the second reciprocating control wheel 232b positioned at the rear side is located in the third operating groove 2223c to be in contact with the third front operating surface 2221c of the third drive carrier 222c, and a peak position 23211b of the front driving surface 2321b of the second reciprocating control wheel 232b positioned at the rear side is located in the fourth operating groove 2223d to be in contact with the fourth front operating surface 2221d of the fourth drive carrier 222d. That is, in the initial state, the third feed assembly 22c is located at the maximum position of the rearward displacement, and the fourth feed assembly 22d is located at the maximum position of the forward displacement.

It will be appreciated that in this embodiment, the peak positions 23211a and 23221a of the first reciprocating control wheel 232a and the tapered surfaces 23213b and 23223b of the second reciprocating control wheel 232b correspond to each other in the axial direction along the length of the connecting member 231. The two groups of feeding components are arranged in a front-back mutually corresponding manner along the length direction of the conveying channel 13 of the handheld 3D drawing device.

When the driving motor 211 is started, as shown in fig. 31A and 31B, the contact position of the front driving surface 2321A of the first reciprocating control wheel 232a on the front side with the first front acting surface 2221A of the first drive rack 222a is changed from the gradually-changing surface 23213a to one of the peak positions 23211A of the front driving surface 2321A of the first reciprocating control wheel 232a, and the contact position of the rear driving surface 2322a of the first reciprocating control wheel 232a with the first rear acting surface 2222a of the first drive rack 222a is changed from the gradually-changing surface 23223a to one of the valley positions 23222a of the rear driving surface 2322a of the first reciprocating control wheel 232a, so that the front driving surface 2321A of the first reciprocating control wheel 232a applies an urging force to the first front acting surface 2221A of the first drive rack 222a to drive the first consumable forward displacement to reach the first front feeding driving component 221A, thereby moving forward and driving the consumable forward to reach the first front feeding component.

At this stage, the contact position of the rear driving surface 2322a of the first shuttle wheel 232a with the second rear acting surface 2222b of the second drive frame 222b is changed from the gradually changing surface 23223a to a peak position 23221a of the rear driving surface 2322a of the first shuttle wheel 232a, and the contact position of the front driving surface 2321a of the first shuttle wheel 232a with the second front acting surface 2221b of the second drive frame 222b is changed from the gradually changing surface 23213a to a valley position 23212a of the front driving surface 2321a of the first shuttle wheel 232a, so that the rear driving surface 2322a of the first shuttle wheel 232a applies an urging force to the second rear acting surface 2222b of the second drive frame 222b to drive the second drive frame 222b to move backward until it reaches the maximum displacement position of the backward movement.

The contact position of the front driving surface 2321b of the second shuttle wheel 232b with the third front acting surface 2221c of the third drive frame 222c is changed from the valley position 23212b to an intermediate position of one of the gradually changing surfaces 23213b of the front driving surface 2321b of the second shuttle wheel 232b, and the contact position of the rear driving surface 2322b of the second shuttle wheel 232b with the third rear acting surface 2222c of the third drive frame 222c is changed from the peak position 23221b to an intermediate position of one of the gradually changing surfaces 23223b of the rear driving surface 2322b of the second shuttle wheel 232b, at which time the front driving surface 2321b of the second shuttle wheel 232b applies an urging force to the third front acting surface 2221c of the third drive frame 222c to drive the third drive frame 222c to move forward to a position half of its maximum distance of displacement forward.

The contact position between the rear driving surface 2322b of the second shuttle wheel 232b and the fourth rear acting surface 2222d of the fourth driving frame 222d is changed from the valley position 23222b to an intermediate position of one of the gradually changing surfaces 23223b of the rear driving surface 2322b of the second shuttle wheel 232b, and the contact position between the front driving surface 2321b of the second shuttle wheel 232b and the fourth front acting surface 2221d of the fourth driving frame 222d is changed from the peak position 23211b to an intermediate position of one of the gradually changing surfaces 23213b of the front driving surface 2322b of the second shuttle wheel 232b, at which time the rear driving surface 2322b of the second shuttle wheel 232b applies an urging force to the fourth rear acting surface 2322 d of the fourth driving frame 222d to drive the fourth driving frame 222d to reach a position half of the maximum rearward displacement distance thereof.

At this stage, the first driving rack 222a and the third driving rack 222c are respectively driven to move forward to drive the corresponding first feeding element 221a and the third feeding element 221c to move forward, so as to drive the consumable part 1 to move forward. And at the switching instant when the first driving rack 222a reaches the maximum displacement of the foremost position to prepare for the backward movement, the speed of the first feeding element 221a tends to 0, whereas the third driving rack 222c moves only to reach the half position of the maximum distance of the forward displacement thereof, so the third driving rack 222c still remains driven to move forward, so that the third feeding element 221c remains in the state of driving the consumable part 1 to move forward. So that during the successive periods of forward transport of the consumable 1, at least one of said feed assemblies 22c is in the process of driving the consumable 1 forward, so that the feeding process does not produce intermittence. That is, at this stage of this embodiment, both said first feeding assembly 22a and said third feeding assembly 22c are in the process of driving the consumable 1 forward, and said first feeding assembly 22a is one-quarter feeding cycle faster than said third feeding assembly 22 c.

As shown in fig. 32A and 32B. The driving motor 211 continues to operate, and the positions on the two gradually changing surfaces 23213a of the front driving surface 2321a of the first reciprocating control wheel 232a are rotated into the first operating groove 2223a and the second operating groove 2223b, respectively, to contact the first front operating surface 2221a of the first driving frame 222a and the second front operating surface 2221b of the second driving frame 222b. The positions on the two gradually-changing surfaces 23223a of the rear driving surface 2322a of the first reciprocating control wheel 232a are respectively rotated into the first acting groove 2223a and the second acting groove 2223b to contact with the first rear acting surface 2222a of the first driving frame 222a and the second rear acting surface 2222b of the second driving frame 222b until the first driving frame 222a and the second driving frame 222b return to the above-mentioned initial positions, at which time the first driving frame 222a moves backwards to drive the first feeding element 221a to move backwards, and the second driving frame 222b moves forwards to drive the second feeding element 221b to move forwards, so that the second feeding element 221b drives the consumable 1 to move forwards in this stage.

The positions on the two tapered surfaces 23213b of the front driving surface 2321b of the second reciprocating control wheel 232b are rotated into the third and fourth working grooves 2223a and 2223b, respectively, to contact the third front working surface 2221c of the third driving frame 222c and the fourth front working surface 2221d of the fourth driving frame 222d. The positions on the two gradually-changing surfaces 23223b of the rear driving surface 2322b of the second reciprocating control wheel 232b are rotated into the third and fourth working grooves 2223c and 2223d, respectively, to contact the third rear working surface 2222c of the third driving frame 222c and the fourth rear working surface 2222d of the fourth driving frame 222d until the third driving frame 222c and the fourth driving frame 222d return to the initial positions, at which time the third driving frame 222c moves forward to drive the third feeding element 221c to move forward to the maximum distance, and the fourth driving frame 222d moves backward to drive the second feeding element 221d to move backward to the maximum distance, so that the third feeding element 221c drives the consumable 1 to move forward in this stage, as shown in the figure. The contact position of the front driving surface 2321b of the second shuttle wheel 232b with the third front acting surface 2221c of the third driving bracket 222c is changed from one of the gradual change surfaces 23213b to one of the peak positions 23211b to move the third driving bracket 222c to a maximum displacement in the forward direction and prepare for the backward movement. The contact position of the rear driving surface 2322b of the second shuttle wheel 232b with the fourth rear acting surface 2222d of the fourth driving frame 222d is changed from one of the gradual change surfaces 23223b to one of the peak positions 23221b to move the fourth driving frame 222d to a maximum displacement rearward and prepare for forward movement.

At this stage, the second feeding assembly 22b and the third feeding assembly 22c are driven to move forward to drive the corresponding second feeding element 221b and the third feeding element 221d to move forward to drive the consumable part 1 to move forward. And when the third feeding assembly 22c moves to reach the maximum forward displacement and is ready to switch to move backwards, the speed of the third feeding element 221c tends to 0, but the second feeding assembly 22b is still in the middle stage of forward displacement, so that the consumable part 1 is ensured that one feeding assembly 22b is always in the process of moving forwards to drive the corresponding feeding element 221b to move forwards in the continuous forward conveying process in the stage, and the feeding process does not generate an intermittent phenomenon.

As shown in fig. 33A and 33B, the contact position of the front driving surface 2321a of the first reciprocating control wheel 232a with the first front acting surface 2221a of the first drive carrier 222a changes from the gradually changing surface 23213A to one of the valley positions 23211a of the front driving surface 2321a of the first reciprocating control wheel 232a, and the contact position of the rear driving surface 2322a of the first reciprocating control wheel 232a with the first rear acting surface 2322a of the first drive carrier 222a changes from the gradually changing surface 23223A to one of the peak positions 23222a of the rear driving surface 2322a of the first reciprocating control wheel 232a, so that the rear driving surface 2322a of the first reciprocating control wheel 232a applies an urging force to the first rear acting surface 2222a of the first drive carrier 222a to drive the first drive carrier 222a to move backward to a maximum displacement.

At this stage, the contact position between the rear driving surface 2322a of the first shuttle wheel 232a and the second rear acting surface 2222b of the second driving frame 222b is changed from the gradually changing surface 23223a to a valley position 23221a of the rear driving surface 2322 of the first shuttle wheel 232a, and the contact position between the front driving surface 2321a of the first shuttle wheel 232a and the second front acting surface 2221b of the second driving frame 222b is changed from the gradually changing surface 23213a to a peak position 23212a of the front driving surface 2321a of the first shuttle wheel 232a, so that the front driving surface 2321a of the first shuttle wheel 232a applies an urging force to the second front acting surface 2221b of the second driving frame 222b to drive the second driving frame 222b to move forward until the maximum feeding displacement position of the consumable part 221b is reached, and thus the consumable part moves forward by the maximum feeding displacement distance.

The positions on the two tapered surfaces 23213b of the front driving surface 2321b of the second reciprocating control wheel 232b are rotated into the third and fourth working grooves 2223a and 2223b, respectively, to contact the third front working surface 2221c of the third driving frame 222c and the fourth front working surface 2221d of the fourth driving frame 222d. The positions on the two gradually changing surfaces 23223b of the rear driving surface 2322b of the second reciprocating control wheel 232b are respectively rotated into the third acting groove 2223c and the fourth acting groove 2223d to contact with the third rear acting surface 2222c of the third driving frame 222c and the fourth rear acting surface 2222d of the fourth driving frame 222d, at this time, the third driving frame 222c moves backward to drive the third feeding element 221c to move backward, the fourth driving frame 222d moves forward to drive the fourth feeding element 221d to move forward to a position half of the maximum distance by which the fourth feeding element 221d can move forward, so that the fourth feeding element 221d drives the consumable 1 to move forward at this stage.

That is, at this stage, the second feeding assembly 22b and the fourth feeding assembly 22d are driven to move forward for driving the consumable part 1 to move forward. And when the second feeding assembly 22b is displaced forward to the maximum distance and is ready to be switched to move backward, the speed of the second feeding element 221b tends to 0, but the fourth feeding assembly 22d is still in the middle stage of forward displacement, so that one feeding assembly 22d is always in the process of moving forward to drive the corresponding feeding element 221d to move forward in the continuous forward conveying process of the consumable material 1 in the stage, and the feeding process does not generate an intermittent phenomenon.

As shown in fig. 34A and 34B, the first reciprocation control wheel 232a continues to rotate to drive the first drive carriage 222a forward until it reaches its initial position, and to drive the second drive carriage 222B backward until it reaches its initial position. The second shuttle wheel 232b continues to rotate to drive the third drive rack 222c rearward until it reaches a rearward maximum displacement position and to drive the fourth drive rack 222d forward until it reaches a forward maximum displacement position. At this stage, the first feeding assembly 22a and the fourth feeding assembly 22d are driven to move forward for driving the consumable part 1 to move forward. And when the fourth feeding assembly 22d is displaced forward to the maximum distance and is ready to be switched to move backward, the speed of the fourth feeding element 221d tends to 0, but the first feeding assembly 22a is still in the middle stage of forward displacement, so that one feeding assembly 22a is always in the process of moving forward to drive the corresponding feeding element 221a to move forward in the continuous forward conveying process of the consumable material 1 in the stage, and the feeding process does not generate an intermittent phenomenon.

Repeating the above steps, the first feeding element 221a, the second feeding element 221b, the third feeding element 221c and the feeding element 221d are alternately driven to move forward to drive the consumable part 1 to move forward, thereby ensuring that the consumable part 1 can be continuously conveyed forward. As shown in fig. 23 and fig. 35 to 39, in this embodiment, the handheld 3D rendering device further includes a material returning mechanism 40, which is a mechanical structure to facilitate the material returning operation of the consumable 1. Specifically, the material returning mechanism 40 includes a material returning switch 41, a transmission member 42 connected to the material returning switch 41, two pushing members 43 connected to the transmission member 42, and an elastic element 44 connected to one of the pushing members 43, wherein the material returning switch 41 is disposed on the handheld housing 12 for a user to operate.

The transmission component 42 includes two transmission members 421, one of the transmission members 421 is connected to the material returning switch, and the other transmission member 421 is connected to a pushing component 43 located at the front side. In the initial state, each pushing component 43 is spaced from a corresponding group of two feeding elements 221, and when the material returning switch 41 is operated to slide, the transmission component 42 is driven to move, so that the two pushing components 43 are driven to move to contact with the two feeding elements 221 on at least one side of the two groups of feeding elements 221 and push the two feeding elements 221 on at least one side of the two groups of feeding elements 221, so that the two feeding elements 221 are separated from the consumable 1 respectively to provide a material returning space. In this way, as shown in fig. 37 and 39, the user can directly pull the front end of the consumable 1 out of the handheld 3D drawing device from the position of the heat-fusing mechanism 30 along the conveyance path 13 of the drawing body 10. It will be appreciated that two of said pushing members 43 may also be arranged to be able to push all four of said feeding elements 221.

As shown in fig. 40 and 41, according to the first variant embodiment of the second embodiment of the present invention, the reciprocating feeding mechanism 20 includes two driving motors 211, each driving motor 211 is used for driving one reciprocating control wheel 232, and each reciprocating control wheel 232 drives the reciprocating movement of a group of two feeding assemblies 22. The rotation speed of each of the driving motors 211 may be the same or different, so that the time lengths of the feeding periods of the two groups of feeding assemblies 22 are the same or different. In this embodiment, two of the drive motors 211 may be arranged in tandem.

As shown in fig. 42 and 43, according to a second variant implementation of the second embodiment of the present invention, the reciprocating feeding mechanism 20 includes two of the driving motors 211, and the two driving motors 211 are arranged on opposite sides of the conveying passage 13 and are disposed side by side, so that the length size of the hand-held 3D drawing device can be reduced. Each of the drive motors 211 is configured to drive one of the reciprocating control wheels 232, and each of the reciprocating control wheels 232 drives a set of two of the feed assemblies 22 to reciprocate. The two groups of feeding assemblies 22 are respectively located at two opposite sides of the two driving motors 211, wherein the rotating speed of each driving motor 211 can be the same or different, so that the time lengths of the feeding periods of the two groups of feeding assemblies 22 are the same or different.

As shown in fig. 44 and 45, according to a third variant embodiment of the second embodiment of the present invention, the reciprocating feeding mechanism 20 includes two driving motors 211, and the two driving motors 211 are disposed on opposite sides of the conveying channel 13, and the two driving motors 211 are respectively used for driving one reciprocating control wheel 232, and the transmission assembly 23 of the reciprocating feeding mechanism 20 may further include a set of transmission gears 233 engaged with each other to drive the connecting element 231 to rotate and further drive the corresponding reciprocating control wheel 232 to rotate.

Correspondingly, the utility model provides a handheld 3D draws device's ejection of compact method, it includes that the material loading prepares step, consumptive material and carries step and melt ejection of compact step. Wherein in the feed preparation step, the consumable 1 is inserted into the transport path 13 of the drawing body 10 until the front end of the consumable 1 reaches a heating tube 32. In the consumable conveying step, the consumable 1 is driven to move forward by the plurality of feeding elements 221 of the reciprocating moving mechanism 20. In the heat-melting step, this consumable 1 driven to move forward is heat-melted in the heat-melting mechanism 30 and outputs 3D drawing material outward from the outlet of the conveying passage 13 of the drawing body 10.

In the feeding preparation step, the front end of the consumable part 1 enters from the first partial pipe 141, pushes away each feeding element 221 to pass through the reciprocating material moving mechanism 20 to enter the second partial pipe 142 and reach the heating pipe 32. So that no extra steps are required to transport the consumable 1 from the position of the driving structure to the heating position as in a conventional 3D painting pen.

In the consumable conveying step, the forward displacement of the consumable 1 is driven by the plurality of feeding members 221 capable of being displaced back and forth. Wherein the feeding elements 221 are alternately used to drive the consumable 1 to move forward during the forward transportation of the consumable 1. And in some embodiments, during the forward transport of the consumable 1, it may be always maintained that at least one of said feeding elements 221 is in the forward movement process to maintain the consumable 1 continuously transported forward.

In addition, the present invention may further include a material returning step, when the material returning switch 41 is moved, the material returning switch can drive the pushing element 43 to push the feeding element 221 to separate from the consumable material 1, so that the consumable material 1 that is not used can be taken out from the heating position through the conveying channel 13 by the user.

It will be understood by those skilled in the art that the embodiments of the present invention described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims (25)

1. Be applied to handheld 3D and draw reciprocating type feeding mechanism of device, handheld 3D draws the device and is applicable to and heats the consumptive material melting of a solid and be used for drawing 3D works, its characterized in that, reciprocating type feeding mechanism includes:

at least one power source;

at least one transmission assembly; and

the transmission assembly drives the first feeding assembly and the second feeding assembly to alternately and reciprocally move under the action of energy provided by the power source and acts on the consumable to drive the consumable to move forwards.

2. The reciprocating feeding mechanism applied to the handheld 3D rendering device as claimed in claim 1, wherein the first feeding assembly comprises a first driving rack and a first feeding element connected to the first driving rack, the second feeding assembly comprises a second driving rack and a second feeding element connected to the second driving rack, and the transmission assembly periodically drives the first driving rack and the second driving rack to move back and forth under the action of the energy provided by the power source to drive the corresponding first feeding element and the corresponding second feeding element to move back and forth and contact the consumable to drive the consumable to move forward.

3. The reciprocating feeding mechanism applied to the handheld 3D rendering device as claimed in claim 2, wherein the transmission assembly drives the first driving rack to move forward to drive the corresponding first feeding element to move forward, and simultaneously drives the second driving rack to move backward to drive the corresponding second feeding element to move backward; when the transmission assembly drives the first driving frames to move backwards to drive the corresponding first feeding elements to move backwards, the transmission assembly simultaneously drives the second driving frames to move forwards to drive the corresponding second feeding elements to move forwards.

4. The reciprocating feeding mechanism applied to the handheld 3D drawing device as claimed in claim 1, further comprising a third feeding assembly and a fourth feeding assembly, wherein the driving assembly further drives the third feeding assembly and the fourth feeding assembly to move reciprocally and act on the consumable to drive the consumable to move forward under the action of the power supplied by the power source.

5. The reciprocating feeding mechanism applied to the handheld 3D drawing device as claimed in claim 4, wherein the third feeding assembly comprises a third driving rack and a third feeding element connected to the third driving rack, the fourth feeding assembly comprises a fourth driving rack and a fourth feeding element connected to the fourth driving rack, and the transmission assembly is powered by the power source to periodically drive the third driving rack and the fourth driving rack to move back and forth to drive the corresponding third feeding element and the fourth feeding element to move back and forth and contact the consumable to drive the consumable to move forward.

6. The reciprocating feeding mechanism applied to the handheld 3D rendering device as claimed in claim 2, further comprising a third feeding assembly and a fourth feeding assembly, wherein the third feeding assembly comprises a third driving rack and a third feeding element connected to the third driving rack, the fourth feeding assembly comprises a fourth driving rack and a fourth feeding element connected to the fourth driving rack, and wherein the transmission assembly, under the power supplied by the power source, periodically drives the third driving rack and the fourth driving rack to move back and forth to drive the corresponding third feeding element and the corresponding fourth feeding element to move back and forth and contact the consumable to drive the consumable to move forward.

7. The reciprocating feed mechanism as claimed in claim 2, wherein the power source comprises a driving motor and an output shaft, and the transmission assembly comprises a connecting member and a reciprocating control wheel, wherein the driving motor rotates by supplying power, and the connecting member is connected to the output shaft to be adapted to rotate synchronously with the rotating driving motor and to drive the reciprocating control wheel to rotate, so that the reciprocating control wheel drives the first feed assembly and the second feed assembly to move reciprocally.

8. The reciprocating feed mechanism as claimed in claim 6, wherein the power source comprises at least one driving motor and at least one output shaft, and the transmission assembly comprises a connecting member, a first reciprocating control wheel and a second reciprocating control wheel, wherein the driving motor rotates under the effect of supplying electric energy, the connecting member is connected to the output shaft to rotate synchronously with the rotating driving motor and drive the first reciprocating control wheel and the second reciprocating control wheel to rotate, so that the first reciprocating control wheel drives the first feed assembly and the second feed assembly to move reciprocally, and the second reciprocating control wheel drives the third feed assembly and the fourth feed group to move reciprocally.

9. The reciprocating feed mechanism as claimed in claim 8, wherein the first and second reciprocating control wheels are driven by the same driving motor simultaneously, or the first and second reciprocating control wheels are driven by two driving motors respectively.

10. A reciprocating feeding mechanism applied to a handheld 3D drawing device according to claim 7, wherein the reciprocating control wheel has a front driving surface of the curved surface and a rear driving surface of the curved surface, the first driving frame and the second driving frame each have a front acting surface and a rear acting surface, and when the reciprocating control wheel is driven to rotate, the front driving surface and the rear driving surface of the reciprocating control wheel respectively act on the front acting surface and the rear acting surface of the first driving frame and the second driving frame to drive the first driving frame and the second driving frame to move reciprocally, so as to drive the corresponding first feeding element and second feeding element to move reciprocally back and forth.

11. The reciprocating feed mechanism as applied to a handheld 3D rendering device of claim 10, wherein the first and second drive carriages each have an action slot, the front and rear action faces of each of the first and second drive carriages being located on opposite sides of the action slot, the position on the surface of each of the front and rear drive faces of the reciprocating control wheel being driven to periodically rotate into the action slot to respectively interact with the front and rear action faces of the corresponding first and second drive carriages.

12. The reciprocating feed mechanism as applied to a handheld 3D mapping device of claim 10, wherein the front and rear drive faces of the reciprocating control wheel each have at least one peak location, at least one valley location, and at least two gradual change faces extending between adjacent ones of the peak and valley locations, wherein the peak and valley locations of the front drive face and the valley and peak locations of the rear drive face are located on opposite sides corresponding to the reciprocating control wheel.

13. The reciprocating feed mechanism applied to a handheld 3D rendering device according to claim 8, wherein the first and second reciprocating control wheels each have a front driving surface with a curved surface and a rear driving surface with a curved surface, the first, second, third and fourth driving frames each have a front acting surface and a rear acting surface, and when the first reciprocating control wheel is driven to rotate, the front driving surface and the rear driving surface of the first reciprocating control wheel respectively act on the front acting surface and the rear acting surface of the first and second driving frames to drive the first and second driving frames to move reciprocally, thereby driving the corresponding first and second feeding elements to move reciprocally; when the second reciprocating control wheel is driven to rotate, the front side driving surface and the rear side driving surface of the second reciprocating control wheel respectively act on the front side acting surface and the rear side acting surface of the third driving frame and the fourth driving frame to drive the third driving frame and the fourth driving frame to move in a reciprocating manner, so that the third feeding element and the fourth feeding element are driven to move in a reciprocating manner.

14. The reciprocating feed mechanism applied to a handheld 3D rendering device of claim 13, wherein the first, second, third and fourth drive frames each have an action slot, the front and rear action faces of the first and second drive frames are located on opposite sides of the action slot, and the positions on the surfaces of the front and rear drive faces of the first reciprocating control wheel are driven to periodically rotate into the action slot to respectively interact with the front and rear action faces of the corresponding first and second drive frames; the front and rear side engagement surfaces of the respective third and fourth drive frames are located on opposite sides of the engagement slot, and the positions on the respective surfaces of the front and rear side drive surfaces of the second reciprocating control wheel are driven to periodically rotate into the engagement slot to respectively engage the front and rear side engagement surfaces of the respective third and fourth drive frames.

15. The reciprocating feed mechanism as applied to a handheld 3D mapping device of claim 13, wherein the front and rear drive faces of the first and second reciprocating control wheels each have at least one peak position, at least one valley position, and at least two gradual change faces extending between adjacent ones of the peak and valley positions, wherein the peak and valley positions of the front drive face are on opposite sides of the valley and peak positions of the rear drive face.

16. The reciprocating feed mechanism for a handheld 3D mapping device as claimed in claim 15, wherein the first feed assembly and the second feed assembly constitute one set of feed assemblies, the third feed assembly and the fourth feed assembly constitute another set of feed assemblies, and when the driving rack of one of the feed assemblies in each set of feed assemblies is in contact with the peak position of the corresponding reciprocating control wheel, the driving rack of the other feed assembly is in contact with the valley position of the corresponding reciprocating control wheel.

17. The reciprocating feed mechanism as applied to a handheld 3D rendering device of claim 16, wherein said first reciprocating control wheel and said second reciprocating control wheel each have 2k +1 said peak position and 2k +1 said valley position on opposite sides thereof, wherein K e N +, N + is a positive set of natural numbers.

18. The reciprocating feed mechanism as claimed in claim 17, wherein each peak position of one of the two reciprocating control wheels and a gradual surface of the other reciprocating control wheel between the peak position and the valley position are arranged in axial correspondence with each other.

19. The reciprocating feed mechanism for application to a handheld 3D mapping device of claim 15, wherein the progressive surfaces of the first and second reciprocating control wheels are parabolic curved surfaces.

20. The reciprocating feed mechanism as applied to a handheld 3D rendering device of claim 13, wherein during forward transport of the consumable material, at least one of the first feed assembly and the second feed assembly is in forward motion, and at least one of the third feed assembly and the fourth feed assembly is in forward motion.

21. The reciprocating feed mechanism as claimed in claim 20, wherein during forward transport of the consumable material, two of the first, second, third and fourth feed assemblies are in forward motion and reach a maximum position of forward displacement at intervals in time.

22. The reciprocating feeding mechanism as claimed in any one of claims 2 to 3 and 6 to 21, applied to a handheld 3D drawing device, wherein the handheld 3D drawing device has a conveying channel, wherein the first feeding element and the second feeding element are disposed obliquely with respect to the conveying channel, and each of the first feeding element and the second feeding element is a blade or is integrally formed with the corresponding first driving rack and the second driving rack.

23. The reciprocating feeding mechanism applied to the handheld 3D drawing device according to any one of claims 5 to 6 and 8 to 21, wherein the handheld 3D drawing device has a conveying channel, wherein the third feeding element and the fourth feeding element are disposed obliquely with respect to the conveying channel, and each of the third feeding element and the fourth feeding element is a blade or is integrally formed with the corresponding third driving frame and the fourth driving frame.

24. A reciprocating feed mechanism for use with a handheld 3D rendering device as claimed in claim 22, wherein the reciprocating feed mechanism further comprises two resilient stop elements which bear against the first feed element and the second feed element respectively, such that the first feed element and the second feed element are adapted to remain resiliently in contact with the consumable.

25. The reciprocating feeding mechanism applied to the handheld 3D rendering device as claimed in claim 23, wherein the reciprocating feeding mechanism further comprises two elastic limiting elements respectively pressed against the third feeding element and the fourth feeding element, so that the third feeding element and the fourth feeding element are adapted to maintain elastic contact with the consumable.

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