Printing head consumable cutting device of FDM 3D printer

Abstract

The utility model discloses a printing head consumable cutting device of an FDM3D printer, which comprises a cutter, a cutting rod, a rotating shaft, a reset spring and an impact block, the cutter is arranged between an extrusion gear and a throat pipe of a printing head and is perpendicular to a consumable channel, one end of the cutter is detachably and fixedly connected with the cutting rod, and the other end of the cutter is fixedly connected with the impact block. The rotating shaft is mounted on the printer, the axis of the rotating shaft is parallel to the consumable channel, and the cutting rod is rotatably and fixedly connected with the rotating shaft; the impact block is arranged at the zero point position of the X-axis and the Y-axis of the printer, when the printing head moves in the direction parallel to the X-axis or the Y-axis to collide with the impact block, the cutting rod is pushed to rotate around the rotating shaft, the cutter cuts the consumable channel in the direction perpendicular to the consumable channel, one end of the reset spring is connected with the cutting rod, and the other end of the reset spring is connected with the printing head. According to the scheme, the overall structure is simple, consumables at the printing tail end can be smoothly cut off and separated by rotating the cutter, and the consumables are convenient to replace.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3D printers, and in particular relates to a print head consumables cutting device for an FDM 3D printer. Background Art

[0002] At present, 3D printing (3Dimensional Printing) is a kind of additive manufacturing technology, which is based on computer 3D models and is a layered manufacturing technology controlled by software. 3D printing technology is usually implemented by using digital technology printers; 3D printers can be used in any industry and are widely used in medical, construction, automobile, aerospace and education.

[0003] FDM 3D printing technology, namely fused deposition modeling 3D printing technology, is a type of 3D printing technology. Traditional desktop 3D printers usually adopt FDM molding technology, using prefabricated plastic wires as printing consumables, and then melting and extruding the printed model through a nozzle; during the process of replacing consumables, the consumables are in a high-temperature melting or cooling and solidifying state at the end of the print head; when the end of the consumable is in a high-temperature melting state, if it is directly pulled out, the consumables in the molten fluid state will enter other parts of the print head, causing print head failure; when the end of the consumable is in a solidified state, the consumable cannot be directly pulled out, resulting in a failure to replace the consumable. At this time, the consumables at the end of the print need to be cut off and separated to achieve the purpose of replacing the consumables.

[0004] Therefore, a new technology is needed to solve the problem in the prior art that the consumables at the end of the printing are not easy to be cut and separated. Utility Model Content

[0005] In order to solve the above problems in the prior art, the utility model provides a print head consumables cutting device for an FDM 3D printer, which can smoothly cut and separate the consumables at the end of the printing process, making it easy to replace the consumables.

[0006] The utility model adopts the following technical solutions:

[0007] A consumables cutting device for a print head of an FDM 3D printer, comprising a cutter, a cutting rod, a rotating shaft, a return spring and an impact block, wherein the cutter is located on a plane between an extrusion gear and a throat of the print head and is perpendicular to a consumables channel, one end of the cutter is detachably fixedly connected to the cutting rod, the rotating shaft is mounted on the printer and its axis is parallel to the consumables channel, and the cutting rod is rotatably fixedly connected to the rotating shaft;

[0008] The impact block is arranged at the zero point position of the XY axis of the printer, and when the print head moves along a direction parallel to the X or Y axis until it collides with the impact block, the cutting rod rotates around the axis of the rotating shaft, and the cutter can cut the consumable channel in a direction perpendicular to the consumable channel;

[0009] One end of the return spring is connected to the cutting rod, and the other end is connected to the print head.

[0010] As a further improvement of the technical solution of the utility model, it also includes a fixing plate, the cutting rod is fixedly connected to the fixing plate in an L shape, the fixing plate is provided with a first through hole for the rotating shaft to pass through, and the cutter is installed on the fixing plate.

[0011] As a further improvement of the technical solution of the utility model, a slot is further provided on the fixing plate, and the cutter is embedded in the slot and is detachably fixedly connected to the fixing plate.

[0012] As a further improvement of the technical solution of the utility model, the first through hole is located at the bottom of the slot, the cutter is provided with a second through hole coaxial with the first through hole, and the rotating shaft passes through the second through hole and the first through hole in sequence from top to bottom.

[0013] As a further improvement of the technical solution of the utility model, the printer is provided with a mounting hole, the upper end of the rotating shaft is inserted into the mounting hole and connected to the printer, the lower end is provided with a limiting portion, the fixing plate is located above the limiting portion, and the size of the limiting portion is larger than the size of the first through hole.

[0014] As a further improvement of the technical solution of the utility model, the mounting hole is a threaded hole, and the upper end of the rotating shaft is provided with a threaded section adapted to the mounting hole.

[0015] As a further improvement of the technical solution of the utility model, the return spring is provided with a fixed end and a movable end, the fixed end is fixed on the printer, and the movable end abuts against the side surface of the fixed plate.

[0016] As a further improvement of the technical solution of the utility model, the printer is further provided with a fixed shaft, and the reset spring is provided with a shaft through hole for the fixed shaft to be inserted.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The overall structure of the print head consumables cutting device of the FDM3D printer of this scheme is simple. The impact block is set at an XY axis extreme position other than the origin of the printer. When the print head moves in a direction parallel to the X or Y axis until it collides with the impact block, it pushes the cutting rod to rotate around the axis of the rotating shaft. The cutter can cut the consumables in the consumable channel in a direction perpendicular to the consumable channel, and can smoothly cut and separate the consumables at the end of the printing, which is convenient for replacing consumables. After cutting off the consumables, the reset spring can drive the cutting rod to rotate and reset, and the cutter rotates and resets synchronously with the cutting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The technology of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0020] Figure 1 It is a schematic diagram of the installation structure of the utility model on a printer;

[0021] Figure 2 It is a schematic diagram of the structure of the utility model and the consumables to be cut;

[0022] Figure 3 It is a schematic diagram of the connection structure between the cutter, the fixed plate and the cutting rod;

[0023] Figure 4 It is an axonometric view of the connection structure between the cutting rod and the fixing plate from one perspective;

[0024] Figure 5 It is an axonometric view of the connection structure between the cutting rod and the fixing plate from another perspective;

[0025] Figure 6 It's a copper nut.

[0026] Reference numerals:

[0027] 1-cutter; 11-second through hole; 12-second fixing hole;

[0028] 2- cutting rod;

[0029] 3-rotating shaft; 31-limiting part;

[0030] 4-reset spring; 41-shaft through hole; 41-fixed end; 43-movable end;

[0031] 5- Impact block;

[0032] 6-printer; 61-extrusion gear component; 62-throat; 63-mounting hole; 64-consumable material channel;

[0033] 7-fixing plate; 71-slot; 72-first through hole; 73-first fixing hole;

[0034] 8-Fixing bolts;

[0035] 9- Consumables;

[0036] 10-Copper nut. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the utility model, so as to fully understand the purpose, scheme and effect of the utility model. It should be noted that the embodiments and features in the embodiments in this application can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0038] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the accompanying drawings.

[0039] Reference Figures 1 to 6, a print head consumables cutting device for an FDM 3D printer, which is installed on the main body of the 3D printer and is arranged near the print head, and is used to cut off the consumables at the print head, including a cutter 1, a cutting rod 2, a rotating shaft 3, a reset spring 4 and an impact block 5. The cutter 1 is located on a plane between the extrusion gear component 61 and the throat 62 of the print head in the vertical direction and is perpendicular to the consumables channel 64. The cutter 1 can cut the consumables channel when rotating in this plane. A slit or gap for the cutter 1 to rotate is provided between the print head extrusion gear component 61 and the throat 62, and the slit plane intersects the consumables channel 64 vertically. One end of the cutter 1 is detachably fixedly connected to the cutting rod 2, the rotating shaft 3 is installed on the printer body and its axis is parallel to the consumables channel 64, and the cutting rod 2 is rotatably fixedly connected to the rotating shaft 3. The impact block 5 is set at the zero point position of the XY axis of the 3D printer 6. When the print head moves along the direction parallel to the X axis or the Y axis until it collides with the impact block 5, the cutting rod 2 is pushed so that the cutting rod 2 rotates around the rotating shaft 3. The axis of the rotating shaft 3 is the rotation axis of the cutting rod 2. The cutter 1 rotates synchronously with the cutting rod 2. The cutter 1 can cut the consumable channel 64 in a direction perpendicular to the consumable channel 64, that is, when the cutting rod 2 is pushed, the cutter 1 rotates around the axis of the rotating shaft 3, so that at least a part of the cutter 1 enters the consumable channel 64 to achieve the purpose of cutting the consumables. Among them, the printing head only moves from one direction parallel to the X or Y axis to collide with the impact block 5, and the cutting rod 2 is triggered to drive the cutter 1 to rotate synchronously, so that the cutter 1 enters the consumable channel 64 to cut the consumables; the origin or zero point position of the XY axis of the 3D printer can be set according to the conventional method. One end of the reset spring 4 is connected to the cutting rod 2, and the other end is connected to the print head.

[0040] The print head consumables cutting device of the FDM3D printer of this scheme adopts a rotating cutter 1 to achieve the purpose of cutting consumables. Compared with other consumables cutting devices, it has the advantages of compact structure, simplicity, reliability, and not easy to jam. The print head only moves from a direction parallel to the X or Y axis to hit the impact block 5, and the cutting rod 2 is triggered to drive the cutter 1 to rotate synchronously, so that the cutter 1 enters the consumable channel 64 to cut the consumables, and can smoothly cut and separate the consumables at the end of the print, which is convenient for replacing consumables. After cutting the consumables, the reset spring 4 can drive the cutting rod 2 to rotate and reset, and the cutter 1 rotates and resets synchronously with the cutting rod 2. The cutter 1 can be used to cut the consumables and then pull out the consumables for replacement, so as to prevent the molten printing wire from being pulled out to the extrusion gear to cause a material jam. The print head consumables cutting device of the FDM3D printer 6 of this scheme can automatically perform the cutting action by a preset program during use, and the process is simple and reliable.

[0041] Specifically, the print head consumables cutting device of the FDM3D printer of the present scheme also includes a fixed plate 7, the cutting rod 2 is fixedly connected to the fixed plate 7 in an L shape, the fixed plate 7 is provided with a first through hole 72 for the rotating shaft 3 to pass through, and the cutter 1 is installed on the fixed plate 7. Through the setting of the fixed plate 7, the cutter 1 can be easily connected to the cutting rod 2.

[0042] Specifically, the fixing plate 7 is also provided with a slot 71. After the cutter 1 is inserted into the slot 71, the cutter 1 can be detachably fixedly connected to the fixing plate 7 by a fixing bolt 8, and the bolt passes through the cutter 1 and the fixing plate 7 to fix them together. The provision of the slot 71 facilitates the positioning of the installation position of the cutter 1 during installation, and can also limit the relative movement of the cutter 1 and the fixing plate 7 in the horizontal direction to a certain extent. The slot 71 is provided with a first notch and a second notch that are interconnected, the first notch opening faces upward, and the second notch faces the side of the fixing plate 7. One end of the cutter 1 is inserted into the slot 71, and the other end is provided with a blade for cutting.

[0043] Specifically, the first through hole 72 is located at the bottom of the slot 71, making the structure more compact. The cutter 1 is provided with a second through hole 11 coaxial with the first through hole 72, and the rotating shaft 3 passes through the second through hole 11 and the first through hole 72 from top to bottom. The setting of the fixing bolt 8 and the rotating shaft 3 can better limit the relative movement of the cutter 1 and the fixed plate 7 in the horizontal direction, making the connection structure between the cutter 1 and the fixed plate 7 more stable and reliable. Among them, the slot 71 is provided with a first fixing hole 73 for inserting an empty fixing bolt 8, and the cutter 1 is provided with a second fixing hole 12 corresponding to the first fixing hole 73. The fixing bolt 8 extends into the second fixing hole 12 and the first fixing hole 73 from top to bottom to connect the cutter 1 and the fixed plate 7 together.

[0044] Specifically, the first fixing hole 73 is a fixing hole for the cutter 1, and the fixing plate 7 is an injection molded part. In mechanical design, a pre-embedded copper nut 10 is usually used on the injection molded part to realize the setting of the threaded mounting hole structure. The copper nuts 10 are pre-embedded at both the upper and lower ends of the first fixing hole 73 to ensure the mounting strength. A threaded section is provided in the center hole of the copper nut 10, and the fixing bolt 8 is inserted into the center hole of the copper nut 10 and is threadedly connected with the copper nut 10.

[0045] Specifically, a mounting hole 63 is provided on the main body of the printer 6, and the mounting hole corresponds to the position of the rotating shaft 3 to facilitate the insertion of the rotating shaft 3. The upper end of the rotating shaft 3 is upwardly inserted into the mounting hole 63 and is detachably fixedly connected to the printer body. A limiting portion 31 is provided at the lower end, and the fixing plate 7 is located above the limiting portion 31. The size of the limiting portion 31 is larger than the size of the first through hole 72.

[0046] Specifically, the mounting hole 63 is a threaded hole, and the upper end of the rotating shaft 3 is provided with a threaded section adapted to the mounting hole 63 . The rotating shaft 3 can preferably be a bolt or a screw, and its nut structure forms the limiting portion 31 .

[0047] Specifically, the reset spring 4 is a torsion spring, a fixed shaft is provided on the printer body, a fixed end 42, a movable end 43 and an axis through hole 41 for inserting the fixed shaft are provided on the torsion spring, during installation, the fixed shaft is inserted into the axis through hole, the fixed end 42 on the torsion spring is fixed on the printer, and the movable end 43 acts on the fixed plate 7 and abuts against the side of the fixed plate 7, which can provide a reset thrust for the fixed plate 7. The cutting rod 2 can be integrally formed with the fixed plate 7. The elastic force of the reset spring 4 acts on the cutting rod 2 through the fixed plate 7, which can drive the cutting rod 2 to reset and keep the cutter 1 away from the consumable channel 64.

[0048] For other contents of the print head consumables cutting device of the FDM 3D printer described in the present invention, please refer to the prior art and will not be repeated here.

[0049] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A print head consumables cutting device for an FDM 3D printer, characterized in that: It includes a cutter, a cutting rod, a rotating shaft, a return spring and a collision block, wherein the cutter is located on a plane between the extrusion gear and the throat of the print head and is perpendicular to the consumables channel, one end of the cutter is detachably fixedly connected to the cutting rod, the rotating shaft is installed on the printer and its axis is parallel to the consumables channel, and the cutting rod is rotatably fixedly connected to the rotating shaft; The impact block is arranged at the zero point position of the XY axis of the printer, and when the print head moves along a direction parallel to the X or Y axis until it collides with the impact block, the cutting rod rotates around the axis of the rotating shaft, and the cutter can cut the consumable channel in a direction perpendicular to the consumable channel; One end of the return spring is connected to the cutting rod, and the other end is connected to the print head.

2. The print head consumables cutting device of the FDM 3D printer according to claim 1, characterized in that: It also includes a fixing plate, the cutting rod is fixedly connected to the fixing plate in an L shape, the fixing plate is provided with a first through hole for the rotating shaft to pass through, and the cutting knife is installed on the fixing plate.

3. The print head consumables cutting device of the FDM 3D printer according to claim 2, characterized in that: The fixing plate is also provided with a slot, and the cutter is embedded in the slot and is detachably fixedly connected to the fixing plate.

4. The print head consumables cutting device of the FDM 3D printer according to claim 3, characterized in that: The first through hole is located at the bottom of the slot, the cutter is provided with a second through hole coaxial with the first through hole, and the rotating shaft passes through the second through hole and the first through hole in sequence from top to bottom.

5. The print head consumables cutting device of the FDM 3D printer according to claim 4, characterized in that: The printer has a mounting hole, the upper end of the rotating shaft is inserted into the mounting hole to be connected to the printer, the lower end is provided with a limiting portion, the fixing plate is located above the limiting portion, and the size of the limiting portion is larger than the size of the first through hole.

6. The print head consumables cutting device of the FDM 3D printer according to claim 5, characterized in that: The mounting hole is a threaded hole, and the upper end of the rotating shaft is provided with a threaded section adapted to the mounting hole.

7. The print head consumables cutting device of the FDM 3D printer according to claim 5, characterized in that: The return spring is provided with a fixed end and a movable end, the fixed end is fixed on the printer, and the movable end abuts against the side surface of the fixed plate.

8. The print head consumables cutting device of the FDM 3D printer according to claim 7, characterized in that: The printer is also provided with a fixed shaft, and the reset spring is provided with a shaft through hole for the fixed shaft to be inserted.

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